638407541105 has 16 divisors (see below), whose sum is σ = 769138986000. Its totient is φ = 508694107392.

The previous prime is 638407541087. The next prime is 638407541111. The reversal of 638407541105 is 501145704836.

It can be written as a sum of positive squares in 8 ways, for example, as 226244825104 + 412162716001 = 475652^2 + 641999^2 .

It is a cyclic number.

It is not a de Polignac number, because 638407541105 - 2¹⁴ = 638407524721 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3723527 + ... + 3891203.

It is an arithmetic number, because the mean of its divisors is an integer number (48071186625).

Almost surely, 2^638407541105 is an apocalyptic number.

It is an amenable number.

638407541105 is a deficient number, since it is larger than the sum of its proper divisors (130731444895).

638407541105 is a wasteful number, since it uses less digits than its factorization.

638407541105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170708.

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 638407541105 in words is "six hundred thirty-eight billion, four hundred seven million, five hundred forty-one thousand, one hundred five".