646223625 has 48 divisors (see below), whose sum is σ = 1174358016. Its totient is φ = 341863200.

The previous prime is 646223623. The next prime is 646223639. The reversal of 646223625 is 526322646.

646223625 is a `hidden beast` number, since 6 + 4 + 6 + 2 + 23 + 625 = 666.

It is not a de Polignac number, because 646223625 - 2¹ = 646223623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646223625.

It is not an unprimeable number, because it can be changed into a prime (646223621) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 140614 + ... + 145136.

It is an arithmetic number, because the mean of its divisors is an integer number (24465792).

Almost surely, 2^646223625 is an apocalyptic number.

It is an amenable number.

646223625 is a deficient number, since it is larger than the sum of its proper divisors (528134391).

646223625 is a wasteful number, since it uses less digits than its factorization.

646223625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4671 (or 4658 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The square root of 646223625 is about 25420.9288776000. The cubic root of 646223625 is about 864.5582851729.

The spelling of 646223625 in words is "six hundred forty-six million, two hundred twenty-three thousand, six hundred twenty-five".