641627650944 has 576 divisors, whose sum is σ = 2239697219760. Its totient is φ = 182306267136.

The previous prime is 641627650889. The next prime is 641627650967. The reversal of 641627650944 is 449056726146.

641627650944 is a `hidden beast` number, since 6 + 4 + 1 + 62 + 76 + 509 + 4 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a super-2 number, since 2×641627650944² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 300245844 + ... + 300247980.

Almost surely, 2^641627650944 is an apocalyptic number.

641627650944 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641627650944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1119848609880).

641627650944 is an abundant number, since it is smaller than the sum of its proper divisors (1598069568816).

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

641627650944 is a wasteful number, since it uses less digits than its factorization.

641627650944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377 (or 2346 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 54.

The spelling of 641627650944 in words is "six hundred forty-one billion, six hundred twenty-seven million, six hundred fifty thousand, nine hundred forty-four".