641291772100 has 36 divisors (see below), whose sum is σ = 1590403596544. Its totient is φ = 219871464480.

The previous prime is 641291772073. The next prime is 641291772137. The reversal of 641291772100 is 1277192146.

It is a super-2 number, since 2×641291772100² (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 11 ways as a sum of consecutive naturals, for example, 458064852 + ... + 458066251.

Almost surely, 2^641291772100 is an apocalyptic number.

It is an amenable number.

641291772100 is an abundant number, since it is smaller than the sum of its proper divisors (949111824444).

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

641291772100 is a wasteful number, since it uses less digits than its factorization.

641291772100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916131124 (or 916131117 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 40.

The spelling of 641291772100 in words is "six hundred forty-one billion, two hundred ninety-one million, seven hundred seventy-two thousand, one hundred".