638169762876 has 12 divisors (see below), whose sum is σ = 1489062780072. Its totient is φ = 212723254288.

The previous prime is 638169762871. The next prime is 638169762917. The reversal of 638169762876 is 678267961836.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 638169762876.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638169762871) 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, 26590406775 + ... + 26590406798.

It is an arithmetic number, because the mean of its divisors is an integer number (124088565006).

Almost surely, 2^638169762876 is an apocalyptic number.

It is an amenable number.

638169762876 is an abundant number, since it is smaller than the sum of its proper divisors (850893017196).

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

638169762876 is a wasteful number, since it uses less digits than its factorization.

638169762876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53180813580 (or 53180813578 counting only the distinct ones).

The product of its digits is 219469824, while the sum is 69.

The spelling of 638169762876 in words is "six hundred thirty-eight billion, one hundred sixty-nine million, seven hundred sixty-two thousand, eight hundred seventy-six".