638043545340836 has 12 divisors (see below), whose sum is σ = 1116617193348300. Its totient is φ = 319010061527040.

The previous prime is 638043545340671. The next prime is 638043545340847.

638043545340836 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 332942425824100 + 305101119516736 = 18246710^2 + 17467144^2 .

It is a super-2 number, since 2×638043545340836² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2927663261 + ... + 2927881188.

It is an arithmetic number, because the mean of its divisors is an integer number (93051432779025).

Almost surely, 2^{638043545340836} is an apocalyptic number.

It is an amenable number.

638043545340836 is a deficient number, since it is larger than the sum of its proper divisors (478573648007464).

638043545340836 is a wasteful number, since it uses less digits than its factorization.

638043545340836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5855571694 (or 5855571692 counting only the distinct ones).

The product of its (nonzero) digits is 298598400, while the sum is 62.

The spelling of 638043545340836 in words is "six hundred thirty-eight trillion, forty-three billion, five hundred forty-five million, three hundred forty thousand, eight hundred thirty-six".