638619489453 has 8 divisors (see below), whose sum is σ = 928901075616. Its totient is φ = 387042114800.

The previous prime is 638619489451. The next prime is 638619489479. The reversal of 638619489453 is 354984916836.

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

It is not a de Polignac number, because 638619489453 - 2¹ = 638619489451 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638619489451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9676052838 + ... + 9676052903.

It is an arithmetic number, because the mean of its divisors is an integer number (116112634452).

Almost surely, 2^638619489453 is an apocalyptic number.

It is an amenable number.

638619489453 is a deficient number, since it is larger than the sum of its proper divisors (290281586163).

638619489453 is a wasteful number, since it uses less digits than its factorization.

638619489453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19352105755.

The product of its digits is 134369280, while the sum is 66.

The spelling of 638619489453 in words is "six hundred thirty-eight billion, six hundred nineteen million, four hundred eighty-nine thousand, four hundred fifty-three".