163772025921 has 24 divisors (see below), whose sum is σ = 270932785344. Its totient is φ = 93383604000.

The previous prime is 163772025881. The next prime is 163772025943. The reversal of 163772025921 is 129520277361.

It is a happy number.

163772025921 is a `hidden beast` number, since 1 + 6 + 37 + 7 + 20 + 2 + 592 + 1 = 666.

It is not a de Polignac number, because 163772025921 - 2⁷ = 163772025793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163772025421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2753830 + ... + 2812671.

It is an arithmetic number, because the mean of its divisors is an integer number (11288866056).

Almost surely, 2^163772025921 is an apocalyptic number.

It is an amenable number.

163772025921 is a deficient number, since it is larger than the sum of its proper divisors (107160759423).

163772025921 is a wasteful number, since it uses less digits than its factorization.

163772025921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5566981 (or 5566978 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The spelling of 163772025921 in words is "one hundred sixty-three billion, seven hundred seventy-two million, twenty-five thousand, nine hundred twenty-one".