641953288025 has 24 divisors (see below), whose sum is σ = 910206772800. Its totient is φ = 439970448960.

The previous prime is 641953287979. The next prime is 641953288043. The reversal of 641953288025 is 520882359146.

It is a happy number.

It is not a de Polignac number, because 641953288025 - 2¹⁸ = 641953025881 is a prime.

It is a super-2 number, since 2×641953288025² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 599999 + ... + 1282148.

It is an arithmetic number, because the mean of its divisors is an integer number (37925282200).

Almost surely, 2^641953288025 is an apocalyptic number.

It is an amenable number.

641953288025 is a deficient number, since it is larger than the sum of its proper divisors (268253484775).

641953288025 is a wasteful number, since it uses less digits than its factorization.

641953288025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1884113 (or 1884108 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 53.

The spelling of 641953288025 in words is "six hundred forty-one billion, nine hundred fifty-three million, two hundred eighty-eight thousand, twenty-five".