1625624666 has 8 divisors (see below), whose sum is σ = 2438741844. Its totient is φ = 812710720.

The previous prime is 1625624653. The next prime is 1625624669. The reversal of 1625624666 is 6664265261.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1613227225 + 12397441 = 40165^2 + 3521^2 .

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

It is a super-2 number, since 2×1625624666² = 5285311109415223112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1625624669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28925 + ... + 63936.

Almost surely, 2^1625624666 is an apocalyptic number.

1625624666 is a deficient number, since it is larger than the sum of its proper divisors (813117178).

1625624666 is an equidigital number, since it uses as much as digits as its factorization.

1625624666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101616.

The product of its digits is 622080, while the sum is 44.

The square root of 1625624666 is about 40319.0360251829. The cubic root of 1625624666 is about 1175.8179705955.

The spelling of 1625624666 in words is "one billion, six hundred twenty-five million, six hundred twenty-four thousand, six hundred sixty-six".