641667945642 has 16 divisors (see below), whose sum is σ = 1283358276480. Its totient is φ = 213885584352.

The previous prime is 641667945619. The next prime is 641667945719. The reversal of 641667945642 is 246549766146.

641667945642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 547858 + ... + 1258365.

It is an arithmetic number, because the mean of its divisors is an integer number (80209892280).

Almost surely, 2^641667945642 is an apocalyptic number.

641667945642 is an abundant number, since it is smaller than the sum of its proper divisors (641690330838).

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

641667945642 is a wasteful number, since it uses less digits than its factorization.

641667945642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1865437.

The product of its digits is 52254720, while the sum is 60.

The spelling of 641667945642 in words is "six hundred forty-one billion, six hundred sixty-seven million, nine hundred forty-five thousand, six hundred forty-two".