16531631525640 has 256 divisors, whose sum is σ = 61893911808000. Its totient is φ = 3431737774080.

The previous prime is 16531631525639. The next prime is 16531631525699. The reversal of 16531631525640 is 4652513613561.

It is a self number, because there is not a number n which added to its sum of digits gives 16531631525640.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8436571 + ... + 10209749.

It is an arithmetic number, because the mean of its divisors is an integer number (241773093000).

Almost surely, 2^{16531631525640} is an apocalyptic number.

16531631525640 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 16531631525640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30946955904000).

16531631525640 is an abundant number, since it is smaller than the sum of its proper divisors (45362280282360).

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

16531631525640 is a wasteful number, since it uses less digits than its factorization.

16531631525640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1774220 (or 1774216 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 48.

The spelling of 16531631525640 in words is "sixteen trillion, five hundred thirty-one billion, six hundred thirty-one million, five hundred twenty-five thousand, six hundred forty".