625665665 has 8 divisors (see below), whose sum is σ = 783442368. Its totient is φ = 478770160.

The previous prime is 625665647. The next prime is 625665673. The reversal of 625665665 is 566566526.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 625665665 - 2⁸ = 625665409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2720171 + ... + 2720400.

It is an arithmetic number, because the mean of its divisors is an integer number (97930296).

Almost surely, 2^625665665 is an apocalyptic number.

It is an amenable number.

625665665 is a deficient number, since it is larger than the sum of its proper divisors (157776703).

625665665 is a wasteful number, since it uses less digits than its factorization.

625665665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5440599.

The product of its digits is 1944000, while the sum is 47.

The square root of 625665665 is about 25013.3097570074. The cubic root of 625665665 is about 855.2914046095.

The spelling of 625665665 in words is "six hundred twenty-five million, six hundred sixty-five thousand, six hundred sixty-five".