638053853806 has 8 divisors (see below), whose sum is σ = 957694692240. Its totient is φ = 318822289728.

The previous prime is 638053853791. The next prime is 638053853849. The reversal of 638053853806 is 608358350836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×638053853806² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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, 102314691 + ... + 102320926.

It is an arithmetic number, because the mean of its divisors is an integer number (119711836530).

Almost surely, 2^638053853806 is an apocalyptic number.

638053853806 is a deficient number, since it is larger than the sum of its proper divisors (319640838434).

638053853806 is a wasteful number, since it uses less digits than its factorization.

638053853806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204637178.

The product of its (nonzero) digits is 12441600, while the sum is 55.

The spelling of 638053853806 in words is "six hundred thirty-eight billion, fifty-three million, eight hundred fifty-three thousand, eight hundred six".