638156574747 has 12 divisors (see below), whose sum is σ = 921884609880. Its totient is φ = 425390228448.

The previous prime is 638156574661. The next prime is 638156574827. The reversal of 638156574747 is 747475651836.

638156574747 is a `hidden beast` number, since 6 + 3 + 8 + 1 + 56 + 574 + 7 + 4 + 7 = 666.

It is not a de Polignac number, because 638156574747 - 2⁸ = 638156574491 is a prime.

It is a super-2 number, since 2×638156574747² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (638156574347) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3872133 + ... + 4033574.

It is an arithmetic number, because the mean of its divisors is an integer number (76823717490).

Almost surely, 2^638156574747 is an apocalyptic number.

638156574747 is a deficient number, since it is larger than the sum of its proper divisors (283728035133).

638156574747 is a wasteful number, since it uses less digits than its factorization.

638156574747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7914682 (or 7914679 counting only the distinct ones).

The product of its digits is 118540800, while the sum is 63.

It can be divided in two parts, 638156 and 574747, that added together give a triangular number (1212903 = T₁₅₅₇).

The spelling of 638156574747 in words is "six hundred thirty-eight billion, one hundred fifty-six million, five hundred seventy-four thousand, seven hundred forty-seven".