641275907856 has 40 divisors (see below), whose sum is σ = 1684707900960. Its totient is φ = 210135607296.

The previous prime is 641275907777. The next prime is 641275907863. The reversal of 641275907856 is 658709572146.

It is a happy number.

It is a super-2 number, since 2×641275907856² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641275907856.

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, 113216785 + ... + 113222448.

It is an arithmetic number, because the mean of its divisors is an integer number (42117697524).

Almost surely, 2^641275907856 is an apocalyptic number.

It is an amenable number.

641275907856 is an abundant number, since it is smaller than the sum of its proper divisors (1043431993104).

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

641275907856 is a wasteful number, since it uses less digits than its factorization.

641275907856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226439303 (or 226439297 counting only the distinct ones).

The product of its (nonzero) digits is 25401600, while the sum is 60.

The spelling of 641275907856 in words is "six hundred forty-one billion, two hundred seventy-five million, nine hundred seven thousand, eight hundred fifty-six".