16644172653 has 20 divisors (see below), whose sum is σ = 26172125760. Its totient is φ = 10512108072.

The previous prime is 16644172621. The next prime is 16644172661. The reversal of 16644172653 is 35627144661.

16644172653 is a `hidden beast` number, since 166 + 4 + 417 + 26 + 53 = 666.

It is not a de Polignac number, because 16644172653 - 2⁵ = 16644172621 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 16644172599 and 16644172608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16644172253) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5405925 + ... + 5409002.

It is an arithmetic number, because the mean of its divisors is an integer number (1308606288).

Almost surely, 2^16644172653 is an apocalyptic number.

It is an amenable number.

16644172653 is a deficient number, since it is larger than the sum of its proper divisors (9527953107).

16644172653 is a wasteful number, since it uses less digits than its factorization.

16644172653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10814958 (or 10814949 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The spelling of 16644172653 in words is "sixteen billion, six hundred forty-four million, one hundred seventy-two thousand, six hundred fifty-three".