638820314025 has 24 divisors (see below), whose sum is σ = 1078654902144. Its totient is φ = 333455140800.

The previous prime is 638820313933. The next prime is 638820314071. The reversal of 638820314025 is 520413028836.

638820314025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 638820314025 - 2¹⁷ = 638820182953 is a prime.

It is a super-2 number, since 2×638820314025² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90609286 + ... + 90616335.

It is an arithmetic number, because the mean of its divisors is an integer number (44943954256).

Almost surely, 2^638820314025 is an apocalyptic number.

It is an amenable number.

638820314025 is a deficient number, since it is larger than the sum of its proper divisors (439834588119).

638820314025 is a wasteful number, since it uses less digits than its factorization.

638820314025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181225681 (or 181225676 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 638820314025 in words is "six hundred thirty-eight billion, eight hundred twenty million, three hundred fourteen thousand, twenty-five".