16645444155 has 24 divisors (see below), whose sum is σ = 29282736912. Its totient is φ = 8745067584.

The previous prime is 16645444139. The next prime is 16645444169. The reversal of 16645444155 is 55144454661.

16645444155 is a `hidden beast` number, since 1 + 6 + 6 + 454 + 44 + 155 = 666.

It is not a de Polignac number, because 16645444155 - 2⁴ = 16645444139 is a prime.

It is a super-2 number, since 2×16645444155² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 16645444155.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2757424 + ... + 2763453.

It is an arithmetic number, because the mean of its divisors is an integer number (1220114038).

Almost surely, 2^16645444155 is an apocalyptic number.

16645444155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16645444155 is a deficient number, since it is larger than the sum of its proper divisors (12637292757).

16645444155 is a wasteful number, since it uses less digits than its factorization.

16645444155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5520955 (or 5520952 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 45.

The spelling of 16645444155 in words is "sixteen billion, six hundred forty-five million, four hundred forty-four thousand, one hundred fifty-five".