16855772137 has 2 divisors, whose sum is σ = 16855772138. Its totient is φ = 16855772136.

The previous prime is 16855772123. The next prime is 16855772179. The reversal of 16855772137 is 73127755861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15843005161 + 1012766976 = 125869^2 + 31824^2 .

It is an emirp because it is prime and its reverse (73127755861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16855772137 - 2²³ = 16847383529 is a prime.

It is not a weakly prime, because it can be changed into another prime (16855772107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8427886068 + 8427886069.

It is an arithmetic number, because the mean of its divisors is an integer number (8427886069).

Almost surely, 2^16855772137 is an apocalyptic number.

It is an amenable number.

16855772137 is a deficient number, since it is larger than the sum of its proper divisors (1).

16855772137 is an equidigital number, since it uses as much as digits as its factorization.

16855772137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2469600, while the sum is 52.

The spelling of 16855772137 in words is "sixteen billion, eight hundred fifty-five million, seven hundred seventy-two thousand, one hundred thirty-seven".