638653262038 has 32 divisors (see below), whose sum is σ = 1076977671840. Its totient is φ = 281486972160.

The previous prime is 638653262029. The next prime is 638653262047. The reversal of 638653262038 is 830262356836.

638653262038 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (638653262029) and next prime (638653262047).

It is a super-2 number, since 2×638653262038² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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, 1100383 + ... + 1577386.

It is an arithmetic number, because the mean of its divisors is an integer number (33655552245).

Almost surely, 2^638653262038 is an apocalyptic number.

638653262038 is a deficient number, since it is larger than the sum of its proper divisors (438324409802).

638653262038 is a wasteful number, since it uses less digits than its factorization.

638653262038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2678112.

The product of its (nonzero) digits is 7464960, while the sum is 52.

The spelling of 638653262038 in words is "six hundred thirty-eight billion, six hundred fifty-three million, two hundred sixty-two thousand, thirty-eight".