638581173343 has 32 divisors (see below), whose sum is σ = 686591188992. Its totient is φ = 592610172000.

The previous prime is 638581173337. The next prime is 638581173353. The reversal of 638581173343 is 343371185836.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638581173343 is a prime.

It is a super-2 number, since 2×638581173343² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638581173313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26372280 + ... + 26396482.

It is an arithmetic number, because the mean of its divisors is an integer number (21455974656).

Almost surely, 2^638581173343 is an apocalyptic number.

638581173343 is a deficient number, since it is larger than the sum of its proper divisors (48010015649).

638581173343 is a wasteful number, since it uses less digits than its factorization.

638581173343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24555.

The product of its digits is 4354560, while the sum is 52.

The spelling of 638581173343 in words is "six hundred thirty-eight billion, five hundred eighty-one million, one hundred seventy-three thousand, three hundred forty-three".