16656522613 has 4 divisors (see below), whose sum is σ = 17043883648. Its totient is φ = 16269161580.

The previous prime is 16656522587. The next prime is 16656522629. The reversal of 16656522613 is 31622565661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16656522613 - 2³³ = 8066588021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 387360991 = 16656522613 / (1 + 6 + 6 + 5 + 6 + 5 + 2 + 2 + 6 + 1 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16656522613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16656522643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193680453 + ... + 193680538.

It is an arithmetic number, because the mean of its divisors is an integer number (4260970912).

Almost surely, 2^16656522613 is an apocalyptic number.

It is an amenable number.

16656522613 is a deficient number, since it is larger than the sum of its proper divisors (387361035).

16656522613 is an equidigital number, since it uses as much as digits as its factorization.

16656522613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387361034.

The product of its digits is 388800, while the sum is 43.

The spelling of 16656522613 in words is "sixteen billion, six hundred fifty-six million, five hundred twenty-two thousand, six hundred thirteen".