638405164014 has 64 divisors (see below), whose sum is σ = 1401432212736. Its totient is φ = 193049547264.

The previous prime is 638405164013. The next prime is 638405164021. The reversal of 638405164014 is 410461504836.

It is a super-2 number, since 2×638405164014² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638405164013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 386644 + ... + 1194279.

It is an arithmetic number, because the mean of its divisors is an integer number (21897378324).

Almost surely, 2^638405164014 is an apocalyptic number.

638405164014 is an abundant number, since it is smaller than the sum of its proper divisors (763027048722).

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

638405164014 is a wasteful number, since it uses less digits than its factorization.

638405164014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581089.

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 638405164014 in words is "six hundred thirty-eight billion, four hundred five million, one hundred sixty-four thousand, fourteen".