638104246401893 has 16 divisors (see below), whose sum is σ = 639675225692160. Its totient is φ = 636534997502976.

The previous prime is 638104246401889. The next prime is 638104246401899. The reversal of 638104246401893 is 398104642401836.

It is a cyclic number.

It is not a de Polignac number, because 638104246401893 - 2² = 638104246401889 is a prime.

It is a super-2 number, since 2×638104246401893² (a number of 30 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 (638104246401899) 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, 6581127548 + ... + 6581224506.

It is an arithmetic number, because the mean of its divisors is an integer number (39979701605760).

Almost surely, 2^{638104246401893} is an apocalyptic number.

It is an amenable number.

638104246401893 is a deficient number, since it is larger than the sum of its proper divisors (1570979290267).

638104246401893 is a wasteful number, since it uses less digits than its factorization.

638104246401893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105716.

The product of its (nonzero) digits is 23887872, while the sum is 59.

The spelling of 638104246401893 in words is "six hundred thirty-eight trillion, one hundred four billion, two hundred forty-six million, four hundred one thousand, eight hundred ninety-three".