638864276743 has 16 divisors (see below), whose sum is σ = 801110209536. Its totient is φ = 494938758240.

The previous prime is 638864276717. The next prime is 638864276773. The reversal of 638864276743 is 347672468836.

It is a cyclic number.

It is not a de Polignac number, because 638864276743 - 2¹³ = 638864268551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638864276773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23966271 + ... + 23992912.

It is an arithmetic number, because the mean of its divisors is an integer number (50069388096).

Almost surely, 2^638864276743 is an apocalyptic number.

638864276743 is a deficient number, since it is larger than the sum of its proper divisors (162245932793).

638864276743 is a wasteful number, since it uses less digits than its factorization.

638864276743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47959374.

The product of its digits is 195084288, while the sum is 64.

The spelling of 638864276743 in words is "six hundred thirty-eight billion, eight hundred sixty-four million, two hundred seventy-six thousand, seven hundred forty-three".