638353664654 has 16 divisors (see below), whose sum is σ = 968514213600. Its totient is φ = 315517259904.

The previous prime is 638353664629. The next prime is 638353664693. The reversal of 638353664654 is 456466353836.

638353664654 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×638353664654³ (a number of 36 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 638353664593 and 638353664602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355802 + ... + 1184610.

It is an arithmetic number, because the mean of its divisors is an integer number (60532138350).

Almost surely, 2^638353664654 is an apocalyptic number.

638353664654 is a deficient number, since it is larger than the sum of its proper divisors (330160548946).

638353664654 is a wasteful number, since it uses less digits than its factorization.

638353664654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833227.

The product of its digits is 111974400, while the sum is 59.

The spelling of 638353664654 in words is "six hundred thirty-eight billion, three hundred fifty-three million, six hundred sixty-four thousand, six hundred fifty-four".