638613623157 has 8 divisors (see below), whose sum is σ = 851495405376. Its totient is φ = 425737128192.

The previous prime is 638613623147. The next prime is 638613623177. The reversal of 638613623157 is 751326316836.

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

It is not a de Polignac number, because 638613623157 - 2¹⁴ = 638613606773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638613623147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1030833 + ... + 1529654.

It is an arithmetic number, because the mean of its divisors is an integer number (106436925672).

Almost surely, 2^638613623157 is an apocalyptic number.

It is an amenable number.

638613623157 is a deficient number, since it is larger than the sum of its proper divisors (212881782219).

638613623157 is a wasteful number, since it uses less digits than its factorization.

638613623157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2643627.

The product of its digits is 3265920, while the sum is 51.

The spelling of 638613623157 in words is "six hundred thirty-eight billion, six hundred thirteen million, six hundred twenty-three thousand, one hundred fifty-seven".