638648316435 has 8 divisors (see below), whose sum is σ = 1021837306320. Its totient is φ = 340612435424.

The previous prime is 638648316419. The next prime is 638648316457. The reversal of 638648316435 is 534613846836.

638648316435 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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 638648316435 - 2⁴ = 638648316419 is a prime.

It is a super-2 number, since 2×638648316435² (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 7 ways as a sum of consecutive naturals, for example, 21288277200 + ... + 21288277229.

It is an arithmetic number, because the mean of its divisors is an integer number (127729663290).

Almost surely, 2^638648316435 is an apocalyptic number.

638648316435 is a deficient number, since it is larger than the sum of its proper divisors (383188989885).

638648316435 is a wasteful number, since it uses less digits than its factorization.

638648316435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42576554437.

The product of its digits is 29859840, while the sum is 57.

The spelling of 638648316435 in words is "six hundred thirty-eight billion, six hundred forty-eight million, three hundred sixteen thousand, four hundred thirty-five".