638613636454 has 8 divisors (see below), whose sum is σ = 960980904360. Its totient is φ = 318286668336.

The previous prime is 638613636421. The next prime is 638613636457. The reversal of 638613636454 is 454636316836.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 638613636395 and 638613636404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638613636457) 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, 510074164 + ... + 510075415.

It is an arithmetic number, because the mean of its divisors is an integer number (120122613045).

Almost surely, 2^638613636454 is an apocalyptic number.

638613636454 is a deficient number, since it is larger than the sum of its proper divisors (322367267906).

638613636454 is a wasteful number, since it uses less digits than its factorization.

638613636454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020149894.

The product of its digits is 22394880, while the sum is 55.

The spelling of 638613636454 in words is "six hundred thirty-eight billion, six hundred thirteen million, six hundred thirty-six thousand, four hundred fifty-four".