16512056661 has 32 divisors (see below), whose sum is σ = 23315668992. Its totient is φ = 10372855680.

The previous prime is 16512056651. The next prime is 16512056663. The reversal of 16512056661 is 16665021561.

It is not a de Polignac number, because 16512056661 - 2⁵ = 16512056629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16512056663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6199216 + ... + 6201878.

It is an arithmetic number, because the mean of its divisors is an integer number (728614656).

Almost surely, 2^16512056661 is an apocalyptic number.

It is an amenable number.

16512056661 is a deficient number, since it is larger than the sum of its proper divisors (6803612331).

16512056661 is a wasteful number, since it uses less digits than its factorization.

16512056661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3993.

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 16512056661 in words is "sixteen billion, five hundred twelve million, fifty-six thousand, six hundred sixty-one".