1625624638065 has 12 divisors (see below), whose sum is σ = 2817749372724. Its totient is φ = 866999806944.

The previous prime is 1625624638061. The next prime is 1625624638069. The reversal of 1625624638065 is 5608364265261.

1625624638065 is a `hidden beast` number, since 1 + 6 + 2 + 5 + 624 + 6 + 3 + 8 + 0 + 6 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (1625624638061) and next prime (1625624638069).

It can be written as a sum of positive squares in 2 ways, for example, as 192664812096 + 1432959825969 = 438936^2 + 1197063^2 .

It is not a de Polignac number, because 1625624638065 - 2² = 1625624638061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1625624638061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18062495934 + ... + 18062496023.

It is an arithmetic number, because the mean of its divisors is an integer number (234812447727).

Almost surely, 2^{1625624638065} is an apocalyptic number.

1625624638065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1625624638065 is a deficient number, since it is larger than the sum of its proper divisors (1192124734659).

1625624638065 is a wasteful number, since it uses less digits than its factorization.

1625624638065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36124991968 (or 36124991965 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 54.

The spelling of 1625624638065 in words is "one trillion, six hundred twenty-five billion, six hundred twenty-four million, six hundred thirty-eight thousand, sixty-five".