16531870656 has 56 divisors (see below), whose sum is σ = 49989232000. Its totient is φ = 4723391232.

The previous prime is 16531870591. The next prime is 16531870669. The reversal of 16531870656 is 65607813561.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6148906 + ... + 6151593.

Almost surely, 2^16531870656 is an apocalyptic number.

16531870656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16531870656 is an abundant number, since it is smaller than the sum of its proper divisors (33457361344).

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

16531870656 is a wasteful number, since it uses less digits than its factorization.

16531870656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12300521 (or 12300511 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 48.

The spelling of 16531870656 in words is "sixteen billion, five hundred thirty-one million, eight hundred seventy thousand, six hundred fifty-six".