646489101625 has 8 divisors (see below), whose sum is σ = 806818398984. Its totient is φ = 517191281200.

The previous prime is 646489101617. The next prime is 646489101631. The reversal of 646489101625 is 526101984646.

It can be written as a sum of positive squares in 4 ways, for example, as 50313630249 + 596175471376 = 224307^2 + 772124^2 .

It is not a de Polignac number, because 646489101625 - 2³ = 646489101617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2585956282 + ... + 2585956531.

It is an arithmetic number, because the mean of its divisors is an integer number (100852299873).

Almost surely, 2^646489101625 is an apocalyptic number.

It is an amenable number.

646489101625 is a deficient number, since it is larger than the sum of its proper divisors (160329297359).

646489101625 is an equidigital number, since it uses as much as digits as its factorization.

646489101625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5171912828 (or 5171912818 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 52.

The spelling of 646489101625 in words is "six hundred forty-six billion, four hundred eighty-nine million, one hundred one thousand, six hundred twenty-five".