6403646525 has 24 divisors (see below), whose sum is σ = 8003029440. Its totient is φ = 5082704640.

The previous prime is 6403646521. The next prime is 6403646549. The reversal of 6403646525 is 5256463046.

It is a happy number.

It is not a de Polignac number, because 6403646525 - 2² = 6403646521 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6403646521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3417989 + ... + 3419861.

It is an arithmetic number, because the mean of its divisors is an integer number (333459560).

Almost surely, 2^6403646525 is an apocalyptic number.

It is an amenable number.

6403646525 is a deficient number, since it is larger than the sum of its proper divisors (1599382915).

6403646525 is a wasteful number, since it uses less digits than its factorization.

6403646525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2885 (or 2880 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 41.

The square root of 6403646525 is about 80022.7875358013. The cubic root of 6403646525 is about 1856.9880846151.

The spelling of 6403646525 in words is "six billion, four hundred three million, six hundred forty-six thousand, five hundred twenty-five".