665001172 has 24 divisors (see below), whose sum is σ = 1344228480. Its totient is φ = 284492160.

The previous prime is 665001143. The next prime is 665001173. The reversal of 665001172 is 271100566.

665001172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×665001172² = 884453117522747168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 665001172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665001173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 443772 + ... + 445267.

It is an arithmetic number, because the mean of its divisors is an integer number (56009520).

Almost surely, 2^665001172 is an apocalyptic number.

It is an amenable number.

665001172 is an abundant number, since it is smaller than the sum of its proper divisors (679227308).

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

665001172 is a wasteful number, since it uses less digits than its factorization.

665001172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889071 (or 889069 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 665001172 is about 25787.6166405506. The cubic root of 665001172 is about 872.8523862914.

The spelling of 665001172 in words is "six hundred sixty-five million, one thousand, one hundred seventy-two".