641506625 has 8 divisors (see below), whose sum is σ = 800600424. Its totient is φ = 513205200.

The previous prime is 641506597. The next prime is 641506667. The reversal of 641506625 is 526605146.

It can be written as a sum of positive squares in 4 ways, for example, as 6265009 + 635241616 = 2503^2 + 25204^2 .

It is not a de Polignac number, because 641506625 - 2²⁴ = 624729409 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, 2565902 + ... + 2566151.

It is an arithmetic number, because the mean of its divisors is an integer number (100075053).

Almost surely, 2^641506625 is an apocalyptic number.

It is an amenable number.

641506625 is a deficient number, since it is larger than the sum of its proper divisors (159093799).

641506625 is an equidigital number, since it uses as much as digits as its factorization.

641506625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5132068 (or 5132058 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 641506625 is about 25327.9810683757. The cubic root of 641506625 is about 862.4495804735.

The spelling of 641506625 in words is "six hundred forty-one million, five hundred six thousand, six hundred twenty-five".