641555826000840 has 128 divisors (see below), whose sum is σ = 2139108394636800. Its totient is φ = 171034435630080.

The previous prime is 641555826000839. The next prime is 641555826000877. The reversal of 641555826000840 is 48000628555146.

641555826000840 is a `hidden beast` number, since 6 + 4 + 1 + 5 + 558 + 2 + 6 + 0 + 0 + 0 + 84 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77878737 + ... + 85721696.

It is an arithmetic number, because the mean of its divisors is an integer number (16711784333100).

Almost surely, 2^{641555826000840} is an apocalyptic number.

641555826000840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

641555826000840 is an abundant number, since it is smaller than the sum of its proper divisors (1497552568635960).

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

641555826000840 is a wasteful number, since it uses less digits than its factorization.

641555826000840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163604084 (or 163604074 counting only the distinct ones).

The product of its (nonzero) digits is 9216000, while the sum is 54.

The spelling of 641555826000840 in words is "six hundred forty-one trillion, five hundred fifty-five billion, eight hundred twenty-six million, eight hundred forty", and thus it is an aban number.