638586404413 has 4 divisors (see below), whose sum is σ = 639309606208. Its totient is φ = 637863202620.

The previous prime is 638586404411. The next prime is 638586404461. The reversal of 638586404413 is 314404685836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 638586404413 - 2¹ = 638586404411 is a prime.

It is a super-2 number, since 2×638586404413² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638586404411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361599573 + ... + 361601338.

It is an arithmetic number, because the mean of its divisors is an integer number (159827401552).

Almost surely, 2^638586404413 is an apocalyptic number.

It is an amenable number.

638586404413 is a deficient number, since it is larger than the sum of its proper divisors (723201795).

638586404413 is an equidigital number, since it uses as much as digits as its factorization.

638586404413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723201794.

The product of its (nonzero) digits is 6635520, while the sum is 52.

The spelling of 638586404413 in words is "six hundred thirty-eight billion, five hundred eighty-six million, four hundred four thousand, four hundred thirteen".