16655560651 has 4 divisors (see below), whose sum is σ = 16679664904. Its totient is φ = 16631456400.

The previous prime is 16655560643. The next prime is 16655560661. The reversal of 16655560651 is 15606555661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15606555661 = 311 ⋅50181851.

It is a cyclic number.

It is not a de Polignac number, because 16655560651 - 2³ = 16655560643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16655560661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12051090 + ... + 12052471.

It is an arithmetic number, because the mean of its divisors is an integer number (4169916226).

Almost surely, 2^16655560651 is an apocalyptic number.

16655560651 is a deficient number, since it is larger than the sum of its proper divisors (24104253).

16655560651 is an equidigital number, since it uses as much as digits as its factorization.

16655560651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24104252.

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 16655560651 in words is "sixteen billion, six hundred fifty-five million, five hundred sixty thousand, six hundred fifty-one".