16261321656 has 16 divisors (see below), whose sum is σ = 40653304200. Its totient is φ = 5420440544.

The previous prime is 16261321621. The next prime is 16261321679. The reversal of 16261321656 is 65612316261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338777511 + ... + 338777558.

Almost surely, 2^16261321656 is an apocalyptic number.

It is an amenable number.

16261321656 is an abundant number, since it is smaller than the sum of its proper divisors (24391982544).

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

16261321656 is a wasteful number, since it uses less digits than its factorization.

16261321656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677555078 (or 677555074 counting only the distinct ones).

The product of its digits is 77760, while the sum is 39.

The spelling of 16261321656 in words is "sixteen billion, two hundred sixty-one million, three hundred twenty-one thousand, six hundred fifty-six".