638053891626 has 32 divisors (see below), whose sum is σ = 1277551820160. Its totient is φ = 212444054784.

The previous prime is 638053891621. The next prime is 638053891633. The reversal of 638053891626 is 626198350836.

It is a happy number.

It is a super-2 number, since 2×638053891626² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (638053891621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35710371 + ... + 35728233.

It is an arithmetic number, because the mean of its divisors is an integer number (39923494380).

Almost surely, 2^638053891626 is an apocalyptic number.

638053891626 is an abundant number, since it is smaller than the sum of its proper divisors (639497928534).

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

638053891626 is a wasteful number, since it uses less digits than its factorization.

638053891626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24270.

The product of its (nonzero) digits is 11197440, while the sum is 57.

The spelling of 638053891626 in words is "six hundred thirty-eight billion, fifty-three million, eight hundred ninety-one thousand, six hundred twenty-six".