638345346825 has 12 divisors (see below), whose sum is σ = 1055397640208. Its totient is φ = 340450851600.

The previous prime is 638345346809. The next prime is 638345346827. The reversal of 638345346825 is 528643543836.

It is a happy number.

It is not a de Polignac number, because 638345346825 - 2⁴ = 638345346809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638345346827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4255635571 + ... + 4255635720.

Almost surely, 2^638345346825 is an apocalyptic number.

It is an amenable number.

638345346825 is a deficient number, since it is larger than the sum of its proper divisors (417052293383).

638345346825 is a wasteful number, since it uses less digits than its factorization.

638345346825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8511271304 (or 8511271299 counting only the distinct ones).

The product of its digits is 49766400, while the sum is 57.

The spelling of 638345346825 in words is "six hundred thirty-eight billion, three hundred forty-five million, three hundred forty-six thousand, eight hundred twenty-five".