646432525 has 6 divisors (see below), whose sum is σ = 801576362. Its totient is φ = 517146000.

The previous prime is 646432519. The next prime is 646432537. The reversal of 646432525 is 525234646.

646432525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 98029801 + 548402724 = 9901^2 + 23418^2 .

It is not a de Polignac number, because 646432525 - 2²⁵ = 612878093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12928626 + ... + 12928675.

Almost surely, 2^646432525 is an apocalyptic number.

It is an amenable number.

646432525 is a deficient number, since it is larger than the sum of its proper divisors (155143837).

646432525 is a wasteful number, since it uses less digits than its factorization.

646432525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25857311 (or 25857306 counting only the distinct ones).

The product of its digits is 172800, while the sum is 37.

The square root of 646432525 is about 25425.0373647710. The cubic root of 646432525 is about 864.6514349543.

The spelling of 646432525 in words is "six hundred forty-six million, four hundred thirty-two thousand, five hundred twenty-five".