646651451525 has 24 divisors (see below), whose sum is σ = 802740407040. Its totient is φ = 516745676160.

The previous prime is 646651451483. The next prime is 646651451549. The reversal of 646651451525 is 525154156646.

It is not a de Polignac number, because 646651451525 - 2⁸ = 646651451269 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 125634002 + ... + 125639148.

It is an arithmetic number, because the mean of its divisors is an integer number (33447516960).

Almost surely, 2^646651451525 is an apocalyptic number.

It is an amenable number.

646651451525 is a deficient number, since it is larger than the sum of its proper divisors (156088955515).

646651451525 is a wasteful number, since it uses less digits than its factorization.

646651451525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9773 (or 9768 counting only the distinct ones).

The product of its digits is 4320000, while the sum is 50.

The spelling of 646651451525 in words is "six hundred forty-six billion, six hundred fifty-one million, four hundred fifty-one thousand, five hundred twenty-five".