638475048515 has 16 divisors (see below), whose sum is σ = 819602183232. Its totient is φ = 475778125824.

The previous prime is 638475048511. The next prime is 638475048521. The reversal of 638475048515 is 515840574836.

It is a cyclic number.

It is not a de Polignac number, because 638475048515 - 2² = 638475048511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638475048511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38710679 + ... + 38727168.

It is an arithmetic number, because the mean of its divisors is an integer number (51225136452).

Almost surely, 2^638475048515 is an apocalyptic number.

638475048515 is a deficient number, since it is larger than the sum of its proper divisors (181127134717).

638475048515 is a wasteful number, since it uses less digits than its factorization.

638475048515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77437966.

The product of its (nonzero) digits is 16128000, while the sum is 56.

The spelling of 638475048515 in words is "six hundred thirty-eight billion, four hundred seventy-five million, forty-eight thousand, five hundred fifteen".