2164172418 has 20 divisors (see below), whose sum is σ = 4849349670. Its totient is φ = 721390752.

The previous prime is 2164172401. The next prime is 2164172429. The reversal of 2164172418 is 8142714612.

It is a happy number.

2164172418 is a `hidden beast` number, since 2 + 1 + 641 + 7 + 2 + 4 + 1 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1086823089 + 1077349329 = 32967^2 + 32823^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6679383 + ... + 6679706.

Almost surely, 2^2164172418 is an apocalyptic number.

2164172418 is an abundant number, since it is smaller than the sum of its proper divisors (2685177252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2164172418 is a wasteful number, since it uses less digits than its factorization.

2164172418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13359103 (or 13359094 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 2164172418 is about 46520.6665687413. Note that the first 3 decimals coincide. The cubic root of 2164172418 is about 1293.4926121869.

The spelling of 2164172418 in words is "two billion, one hundred sixty-four million, one hundred seventy-two thousand, four hundred eighteen".