638407233366 has 64 divisors (see below), whose sum is σ = 1475436695040. Its totient is φ = 180384768000.

The previous prime is 638407233361. The next prime is 638407233367. The reversal of 638407233366 is 663332704836.

It is a super-2 number, since 2×638407233366² (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 (638407233361) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1287616 + ... + 1713116.

It is an arithmetic number, because the mean of its divisors is an integer number (23053698360).

Almost surely, 2^638407233366 is an apocalyptic number.

638407233366 is an abundant number, since it is smaller than the sum of its proper divisors (837029461674).

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

638407233366 is a wasteful number, since it uses less digits than its factorization.

638407233366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425909.

The product of its (nonzero) digits is 7838208, while the sum is 51.

The spelling of 638407233366 in words is "six hundred thirty-eight billion, four hundred seven million, two hundred thirty-three thousand, three hundred sixty-six".