638854305305 has 8 divisors (see below), whose sum is σ = 766982913792. Its totient is φ = 510844945968.

The previous prime is 638854305269. The next prime is 638854305311. The reversal of 638854305305 is 503503458836.

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 638854305305 - 2⁶ = 638854305241 is a prime.

It is a super-2 number, since 2×638854305305² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29800499 + ... + 29821928.

It is an arithmetic number, because the mean of its divisors is an integer number (95872864224).

Almost surely, 2^638854305305 is an apocalyptic number.

It is an amenable number.

638854305305 is a deficient number, since it is larger than the sum of its proper divisors (128128608487).

638854305305 is a wasteful number, since it uses less digits than its factorization.

638854305305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59624575.

The product of its (nonzero) digits is 5184000, while the sum is 50.

The spelling of 638854305305 in words is "six hundred thirty-eight billion, eight hundred fifty-four million, three hundred five thousand, three hundred five".