638660245413 has 16 divisors (see below), whose sum is σ = 896477209280. Its totient is φ = 403313986944.

The previous prime is 638660245361. The next prime is 638660245459. The reversal of 638660245413 is 314542066836.

It is not a de Polignac number, because 638660245413 - 2¹⁴ = 638660229029 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638660245913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236656 + ... + 1154697.

It is an arithmetic number, because the mean of its divisors is an integer number (56029825580).

Almost surely, 2^638660245413 is an apocalyptic number.

It is an amenable number.

638660245413 is a deficient number, since it is larger than the sum of its proper divisors (257816963867).

638660245413 is a wasteful number, since it uses less digits than its factorization.

638660245413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399428.

The product of its (nonzero) digits is 2488320, while the sum is 48.

The spelling of 638660245413 in words is "six hundred thirty-eight billion, six hundred sixty million, two hundred forty-five thousand, four hundred thirteen".