641781979422 has 16 divisors (see below), whose sum is σ = 1283877148800. Its totient is φ = 213875128152.

The previous prime is 641781979393. The next prime is 641781979441. The reversal of 641781979422 is 224979187146.

It is a super-2 number, since 2×641781979422² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13022938 + ... + 13072125.

It is an arithmetic number, because the mean of its divisors is an integer number (80242321800).

Almost surely, 2^641781979422 is an apocalyptic number.

641781979422 is an abundant number, since it is smaller than the sum of its proper divisors (642095169378).

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

641781979422 is a wasteful number, since it uses less digits than its factorization.

641781979422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26099167.

The product of its digits is 12192768, while the sum is 60.

The spelling of 641781979422 in words is "six hundred forty-one billion, seven hundred eighty-one million, nine hundred seventy-nine thousand, four hundred twenty-two".