51561010650 has 48 divisors (see below), whose sum is σ = 127897689024. Its totient is φ = 13746766080.

The previous prime is 51561010649. The next prime is 51561010663. The reversal of 51561010650 is 5601016515.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 752107 + ... + 817793.

It is an arithmetic number, because the mean of its divisors is an integer number (2664535188).

Almost surely, 2^51561010650 is an apocalyptic number.

51561010650 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51561010650 is an abundant number, since it is smaller than the sum of its proper divisors (76336678374).

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

51561010650 is a wasteful number, since it uses less digits than its factorization.

51561010650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70935 (or 70930 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 30.

The spelling of 51561010650 in words is "fifty-one billion, five hundred sixty-one million, ten thousand, six hundred fifty".