638826177121 has 4 divisors (see below), whose sum is σ = 696901284144. Its totient is φ = 580751070100.

The previous prime is 638826177103. The next prime is 638826177131. The reversal of 638826177121 is 121771628836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 638826177121 - 2¹⁷ = 638826046049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638826177131) 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 3 ways as a sum of consecutive naturals, for example, 29037553495 + ... + 29037553516.

It is an arithmetic number, because the mean of its divisors is an integer number (174225321036).

Almost surely, 2^638826177121 is an apocalyptic number.

It is an amenable number.

638826177121 is a deficient number, since it is larger than the sum of its proper divisors (58075107023).

638826177121 is a wasteful number, since it uses less digits than its factorization.

638826177121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58075107022.

The product of its digits is 1354752, while the sum is 52.

The spelling of 638826177121 in words is "six hundred thirty-eight billion, eight hundred twenty-six million, one hundred seventy-seven thousand, one hundred twenty-one".