638863810454 has 8 divisors (see below), whose sum is σ = 961057375848. Its totient is φ = 318511351840.

The previous prime is 638863810447. The next prime is 638863810477. The reversal of 638863810454 is 454018368836.

638863810454 is digitally balanced in base 2, because in such base 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 super-2 number, since 2×638863810454² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 638863810454.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460275827 + ... + 460277214.

It is an arithmetic number, because the mean of its divisors is an integer number (120132171981).

Almost surely, 2^638863810454 is an apocalyptic number.

638863810454 is a deficient number, since it is larger than the sum of its proper divisors (322193565394).

638863810454 is a wasteful number, since it uses less digits than its factorization.

638863810454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920553390.

The product of its (nonzero) digits is 13271040, while the sum is 56.

The spelling of 638863810454 in words is "six hundred thirty-eight billion, eight hundred sixty-three million, eight hundred ten thousand, four hundred fifty-four".