638403602475 has 24 divisors (see below), whose sum is σ = 1055749481280. Its totient is φ = 340399493920.

The previous prime is 638403602401. The next prime is 638403602489. The reversal of 638403602475 is 574206304836.

It is not a de Polignac number, because 638403602475 - 2¹⁵ = 638403569707 is a prime.

It is a super-2 number, since 2×638403602475² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 717849 + ... + 1338698.

It is an arithmetic number, because the mean of its divisors is an integer number (43989561720).

Almost surely, 2^638403602475 is an apocalyptic number.

638403602475 is a deficient number, since it is larger than the sum of its proper divisors (417345878805).

638403602475 is a wasteful number, since it uses less digits than its factorization.

638403602475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2060699 (or 2060694 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 48.

The spelling of 638403602475 in words is "six hundred thirty-eight billion, four hundred three million, six hundred two thousand, four hundred seventy-five".