641667372436 has 12 divisors (see below), whose sum is σ = 1122932993728. Its totient is φ = 320829374232.

The previous prime is 641667372431. The next prime is 641667372491. The reversal of 641667372436 is 634273766146.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641667372431) 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 3 ways as a sum of consecutive naturals, for example, 730746 + ... + 1348081.

Almost surely, 2^641667372436 is an apocalyptic number.

It is an amenable number.

641667372436 is a deficient number, since it is larger than the sum of its proper divisors (481265621292).

641667372436 is a wasteful number, since it uses less digits than its factorization.

641667372436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155998 (or 2155996 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 55.

The spelling of 641667372436 in words is "six hundred forty-one billion, six hundred sixty-seven million, three hundred seventy-two thousand, four hundred thirty-six".