641655256 has 24 divisors (see below), whose sum is σ = 1322421660. Its totient is φ = 291661040.

The previous prime is 641655229. The next prime is 641655257. The reversal of 641655256 is 652556146.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641655257) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 330466 + ... + 332401.

Almost surely, 2^641655256 is an apocalyptic number.

It is an amenable number.

641655256 is an abundant number, since it is smaller than the sum of its proper divisors (680766404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641655256 is a wasteful number, since it uses less digits than its factorization.

641655256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662895 (or 662880 counting only the distinct ones).

The product of its digits is 216000, while the sum is 40.

The square root of 641655256 is about 25330.9150249256. The cubic root of 641655256 is about 862.5161824591.

The spelling of 641655256 in words is "six hundred forty-one million, six hundred fifty-five thousand, two hundred fifty-six".