638632762175 has 6 divisors (see below), whose sum is σ = 791904625128. Its totient is φ = 510906209720.

The previous prime is 638632762169. The next prime is 638632762181. The reversal of 638632762175 is 571267236836.

It is an interprime number because it is at equal distance from previous prime (638632762169) and next prime (638632762181).

It is not a de Polignac number, because 638632762175 - 2⁶ = 638632762111 is a prime.

It is a super-2 number, since 2×638632762175² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 638632762175.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 12772655219 + ... + 12772655268.

It is an arithmetic number, because the mean of its divisors is an integer number (131984104188).

Almost surely, 2^638632762175 is an apocalyptic number.

638632762175 is a deficient number, since it is larger than the sum of its proper divisors (153271862953).

638632762175 is a wasteful number, since it uses less digits than its factorization.

638632762175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25545310497 (or 25545310492 counting only the distinct ones).

The product of its digits is 15240960, while the sum is 56.

The spelling of 638632762175 in words is "six hundred thirty-eight billion, six hundred thirty-two million, seven hundred sixty-two thousand, one hundred seventy-five".