638865360167 has 8 divisors (see below), whose sum is σ = 641232506352. Its totient is φ = 636498878400.

The previous prime is 638865360157. The next prime is 638865360173. The reversal of 638865360167 is 761063568836.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 638865360167 - 2⁸ = 638865359911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638865360157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1803692 + ... + 2128622.

It is an arithmetic number, because the mean of its divisors is an integer number (80154063294).

Almost surely, 2^638865360167 is an apocalyptic number.

638865360167 is a deficient number, since it is larger than the sum of its proper divisors (2367146185).

638865360167 is a wasteful number, since it uses less digits than its factorization.

638865360167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332209.

The product of its (nonzero) digits is 26127360, while the sum is 59.

The spelling of 638865360167 in words is "six hundred thirty-eight billion, eight hundred sixty-five million, three hundred sixty thousand, one hundred sixty-seven".