641951566032 has 240 divisors, whose sum is σ = 2036531112000. Its totient is φ = 173259233280.

The previous prime is 641951566021. The next prime is 641951566033. The reversal of 641951566032 is 230665159146.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641951566033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15575532 + ... + 15616692.

It is an arithmetic number, because the mean of its divisors is an integer number (8485546300).

Almost surely, 2^641951566032 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641951566032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1018265556000).

641951566032 is an abundant number, since it is smaller than the sum of its proper divisors (1394579545968).

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

641951566032 is a wasteful number, since it uses less digits than its factorization.

641951566032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41554 (or 41541 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 641951566032 in words is "six hundred forty-one billion, nine hundred fifty-one million, five hundred sixty-six thousand, thirty-two".