16256064321 has 24 divisors (see below), whose sum is σ = 26971648704. Its totient is φ = 9242019360.

The previous prime is 16256064313. The next prime is 16256064329. The reversal of 16256064321 is 12346065261.

16256064321 is a `hidden beast` number, since 1 + 6 + 2 + 5 + 6 + 0 + 643 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (16256064313) and next prime (16256064329).

It is not a de Polignac number, because 16256064321 - 2³ = 16256064313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16256064329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 642495 + ... + 667316.

It is an arithmetic number, because the mean of its divisors is an integer number (1123818696).

Almost surely, 2^16256064321 is an apocalyptic number.

It is an amenable number.

16256064321 is a deficient number, since it is larger than the sum of its proper divisors (10715584383).

16256064321 is a wasteful number, since it uses less digits than its factorization.

16256064321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310021 (or 1310018 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 16256064321 in words is "sixteen billion, two hundred fifty-six million, sixty-four thousand, three hundred twenty-one".