638308158643705 has 16 divisors (see below), whose sum is σ = 835613818315200. Its totient is φ = 464218331690560.

The previous prime is 638308158643679. The next prime is 638308158643747. The reversal of 638308158643705 is 507346851803836.

638308158643705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 638308158643705 - 2²¹ = 638308156546553 is a prime.

It is a super-2 number, since 2×638308158643705² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67838935 + ... + 76672924.

It is an arithmetic number, because the mean of its divisors is an integer number (52225863644700).

Almost surely, 2^{638308158643705} is an apocalyptic number.

It is an amenable number.

638308158643705 is a deficient number, since it is larger than the sum of its proper divisors (197305659671495).

638308158643705 is a wasteful number, since it uses less digits than its factorization.

638308158643705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144592184.

The product of its (nonzero) digits is 348364800, while the sum is 67.

The spelling of 638308158643705 in words is "six hundred thirty-eight trillion, three hundred eight billion, one hundred fifty-eight million, six hundred forty-three thousand, seven hundred five".