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12561311432460 = 2235731937868229
BaseRepresentation
bin1011011011001010100010…
…0000010111111100001100
31122110211221101120021220210
42312302220200113330030
53121301031211314320
642414330430042420
72434345002324000
oct266625040277414
948424841507823
1012561311432460
114003249915a3a
1214aa571949410
137016acba637b
14315d83910700
1516bb364a40e0
hexb6ca8817f0c

12561311432460 has 384 divisors, whose sum is σ = 44342242560000. Its totient is φ = 2646525643776.

The previous prime is 12561311432443. The next prime is 12561311432473. The reversal of 12561311432460 is 6423411316521.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 14033626 + ... + 14901854.

It is an arithmetic number, because the mean of its divisors is an integer number (115474590000).

Almost surely, 212561311432460 is an apocalyptic number.

12561311432460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12561311432460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22171121280000).

12561311432460 is an abundant number, since it is smaller than the sum of its proper divisors (31780931127540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12561311432460 is a wasteful number, since it uses less digits than its factorization.

12561311432460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868318 (or 868302 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

Adding to 12561311432460 its reverse (6423411316521), we get a palindrome (18984722748981).

The spelling of 12561311432460 in words is "twelve trillion, five hundred sixty-one billion, three hundred eleven million, four hundred thirty-two thousand, four hundred sixty".