638613825553 has 16 divisors (see below), whose sum is σ = 698010014592. Its totient is φ = 579441600000.

The previous prime is 638613825491. The next prime is 638613825611. The reversal of 638613825553 is 355528316836.

It is a cyclic number.

It is not a de Polignac number, because 638613825553 - 2⁹ = 638613825041 is a prime.

It is a super-3 number, since 3×638613825553³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 638613825494 and 638613825503.

It is not an unprimeable number, because it can be changed into a prime (638613820553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26966908 + ... + 26990578.

It is an arithmetic number, because the mean of its divisors is an integer number (43625625912).

Almost surely, 2^638613825553 is an apocalyptic number.

It is an amenable number.

638613825553 is a deficient number, since it is larger than the sum of its proper divisors (59396189039).

638613825553 is a wasteful number, since it uses less digits than its factorization.

638613825553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28296.

The product of its digits is 15552000, while the sum is 55.

The spelling of 638613825553 in words is "six hundred thirty-eight billion, six hundred thirteen million, eight hundred twenty-five thousand, five hundred fifty-three".