16502643651 has 12 divisors (see below), whose sum is σ = 23826302808. Its totient is φ = 10155472704.

The previous prime is 16502643643. The next prime is 16502643679. The reversal of 16502643651 is 15634620561.

It is not a de Polignac number, because 16502643651 - 2³ = 16502643643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (16502643551) 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, 16274290 + ... + 16275303.

It is an arithmetic number, because the mean of its divisors is an integer number (1985525234).

Almost surely, 2^16502643651 is an apocalyptic number.

16502643651 is a deficient number, since it is larger than the sum of its proper divisors (7323659157).

16502643651 is a wasteful number, since it uses less digits than its factorization.

16502643651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32549622 (or 32549609 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 16502643651 in words is "sixteen billion, five hundred two million, six hundred forty-three thousand, six hundred fifty-one".