16500072865 has 16 divisors (see below), whose sum is σ = 20443622400. Its totient is φ = 12771236160.

The previous prime is 16500072863. The next prime is 16500072871. The reversal of 16500072865 is 56827000561.

It is not a de Polignac number, because 16500072865 - 2¹ = 16500072863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16500072863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 826987 + ... + 846703.

It is an arithmetic number, because the mean of its divisors is an integer number (1277726400).

Almost surely, 2^16500072865 is an apocalyptic number.

It is an amenable number.

16500072865 is a deficient number, since it is larger than the sum of its proper divisors (3943549535).

16500072865 is a wasteful number, since it uses less digits than its factorization.

16500072865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25152.

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 16500072865 in words is "sixteen billion, five hundred million, seventy-two thousand, eight hundred sixty-five".