646512625 has 32 divisors (see below), whose sum is σ = 884302848. Its totient is φ = 468000000.

The previous prime is 646512617. The next prime is 646512637. The reversal of 646512625 is 526215646.

It is not a de Polignac number, because 646512625 - 2³ = 646512617 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 330400 + ... + 332350.

It is an arithmetic number, because the mean of its divisors is an integer number (27634464).

Almost surely, 2^646512625 is an apocalyptic number.

It is an amenable number.

646512625 is a deficient number, since it is larger than the sum of its proper divisors (237790223).

646512625 is a wasteful number, since it uses less digits than its factorization.

646512625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2218 (or 2208 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The square root of 646512625 is about 25426.6125349013. The cubic root of 646512625 is about 864.6871467091.

It can be divided in two parts, 64651 and 2625, that added together give a palindrome (67276).

The spelling of 646512625 in words is "six hundred forty-six million, five hundred twelve thousand, six hundred twenty-five".