638842767115 has 16 divisors (see below), whose sum is σ = 906338508480. Its totient is φ = 422957969280.

The previous prime is 638842767061. The next prime is 638842767131. The reversal of 638842767115 is 511767248836.

It is not a de Polignac number, because 638842767115 - 2¹⁵ = 638842734347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 638842767115.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 314699856 + ... + 314701885.

It is an arithmetic number, because the mean of its divisors is an integer number (56646156780).

Almost surely, 2^638842767115 is an apocalyptic number.

638842767115 is a deficient number, since it is larger than the sum of its proper divisors (267495741365).

638842767115 is a wasteful number, since it uses less digits than its factorization.

638842767115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629401782.

The product of its digits is 13547520, while the sum is 58.

The spelling of 638842767115 in words is "six hundred thirty-eight billion, eight hundred forty-two million, seven hundred sixty-seven thousand, one hundred fifteen".