638355545115 has 8 divisors (see below), whose sum is σ = 1021368872208. Its totient is φ = 340456290720.

The previous prime is 638355545089. The next prime is 638355545131. The reversal of 638355545115 is 511545553836.

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

It is not a de Polignac number, because 638355545115 - 2⁵ = 638355545083 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21278518156 + ... + 21278518185.

It is an arithmetic number, because the mean of its divisors is an integer number (127671109026).

Almost surely, 2^638355545115 is an apocalyptic number.

638355545115 is a deficient number, since it is larger than the sum of its proper divisors (383013327093).

638355545115 is a wasteful number, since it uses less digits than its factorization.

638355545115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42557036349.

The product of its digits is 5400000, while the sum is 51.

The spelling of 638355545115 in words is "six hundred thirty-eight billion, three hundred fifty-five million, five hundred forty-five thousand, one hundred fifteen".