16561752137 has 16 divisors (see below), whose sum is σ = 18975998592. Its totient is φ = 14159629440.

The previous prime is 16561752089. The next prime is 16561752191. The reversal of 16561752137 is 73125716561.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16561752137 - 2¹⁰ = 16561751113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16561752197) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7748933 + ... + 7751069.

It is an arithmetic number, because the mean of its divisors is an integer number (1185999912).

Almost surely, 2^16561752137 is an apocalyptic number.

It is an amenable number.

16561752137 is a deficient number, since it is larger than the sum of its proper divisors (2414246455).

16561752137 is a wasteful number, since it uses less digits than its factorization.

16561752137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4448.

The product of its digits is 264600, while the sum is 44.

The spelling of 16561752137 in words is "sixteen billion, five hundred sixty-one million, seven hundred fifty-two thousand, one hundred thirty-seven".