638463861203 has 4 divisors (see below), whose sum is σ = 729672984240. Its totient is φ = 547254738168.

The previous prime is 638463861181. The next prime is 638463861209. The reversal of 638463861203 is 302168364836.

638463861203 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 638463861203 - 2¹⁰ = 638463860179 is a prime.

It is a super-2 number, since 2×638463861203² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638463861209) 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, 45604561508 + ... + 45604561521.

It is an arithmetic number, because the mean of its divisors is an integer number (182418246060).

Almost surely, 2^638463861203 is an apocalyptic number.

638463861203 is a deficient number, since it is larger than the sum of its proper divisors (91209123037).

638463861203 is an equidigital number, since it uses as much as digits as its factorization.

638463861203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91209123036.

The product of its (nonzero) digits is 2985984, while the sum is 50.

The spelling of 638463861203 in words is "six hundred thirty-eight billion, four hundred sixty-three million, eight hundred sixty-one thousand, two hundred three".