638655326423 has 8 divisors (see below), whose sum is σ = 643167022176. Its totient is φ = 634147344000.

The previous prime is 638655326381. The next prime is 638655326459. The reversal of 638655326423 is 324623556836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 638655326423 - 2²⁰ = 638654277847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638655316423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 582686 + ... + 1271547.

It is an arithmetic number, because the mean of its divisors is an integer number (80395877772).

Almost surely, 2^638655326423 is an apocalyptic number.

638655326423 is a deficient number, since it is larger than the sum of its proper divisors (4511695753).

638655326423 is a wasteful number, since it uses less digits than its factorization.

638655326423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856665.

The product of its digits is 18662400, while the sum is 53.

The spelling of 638655326423 in words is "six hundred thirty-eight billion, six hundred fifty-five million, three hundred twenty-six thousand, four hundred twenty-three".