16765720641 has 12 divisors (see below), whose sum is σ = 24218333568. Its totient is φ = 11176601784.

The previous prime is 16765720567. The next prime is 16765720691. The reversal of 16765720641 is 14602756761.

16765720641 is a `hidden beast` number, since 1 + 6 + 76 + 572 + 0 + 6 + 4 + 1 = 666.

It is not a de Polignac number, because 16765720641 - 2¹³ = 16765712449 is a prime.

It is a super-2 number, since 2×16765720641² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16765720691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 251176 + ... + 310838.

It is an arithmetic number, because the mean of its divisors is an integer number (2018194464).

Almost surely, 2^16765720641 is an apocalyptic number.

It is an amenable number.

16765720641 is a deficient number, since it is larger than the sum of its proper divisors (7452612927).

16765720641 is a wasteful number, since it uses less digits than its factorization.

16765720641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90892 (or 90889 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 16765720641 in words is "sixteen billion, seven hundred sixty-five million, seven hundred twenty thousand, six hundred forty-one".