642767667364 has 12 divisors (see below), whose sum is σ = 1125213331788. Its totient is φ = 321278144000.

The previous prime is 642767667307. The next prime is 642767667391. The reversal of 642767667364 is 463766767246.

It can be written as a sum of positive squares in 2 ways, for example, as 324852121764 + 317915545600 = 569958^2 + 563840^2 .

It is a junction number, because it is equal to n+sod(n) for n = 642767667296 and 642767667305.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26408737 + ... + 26433064.

It is an arithmetic number, because the mean of its divisors is an integer number (93767777649).

Almost surely, 2^642767667364 is an apocalyptic number.

It is an amenable number.

642767667364 is a deficient number, since it is larger than the sum of its proper divisors (482445664424).

642767667364 is a wasteful number, since it uses less digits than its factorization.

642767667364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52844846 (or 52844844 counting only the distinct ones).

The product of its digits is 256048128, while the sum is 64.

It can be divided in two parts, 642767 and 667364, that added together give a palindrome (1310131).

The spelling of 642767667364 in words is "six hundred forty-two billion, seven hundred sixty-seven million, six hundred sixty-seven thousand, three hundred sixty-four".