641779429220 has 12 divisors (see below), whose sum is σ = 1347736801404. Its totient is φ = 256711771680.

The previous prime is 641779429177. The next prime is 641779429253. The reversal of 641779429220 is 22924977146.

641779429220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 291530884096 + 350248545124 = 539936^2 + 591818^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16044485711 + ... + 16044485750.

It is an arithmetic number, because the mean of its divisors is an integer number (112311400117).

Almost surely, 2^641779429220 is an apocalyptic number.

It is an amenable number.

641779429220 is an abundant number, since it is smaller than the sum of its proper divisors (705957372184).

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

641779429220 is a wasteful number, since it uses less digits than its factorization.

641779429220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32088971470 (or 32088971468 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 53.

The spelling of 641779429220 in words is "six hundred forty-one billion, seven hundred seventy-nine million, four hundred twenty-nine thousand, two hundred twenty".