633688386221 has 12 divisors (see below), whose sum is σ = 696590887776. Its totient is φ = 576032900520.

The previous prime is 633688386211. The next prime is 633688386229. The reversal of 633688386221 is 122683886336.

633688386221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-633688386221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (633688386229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1303430 + ... + 1722296.

It is an arithmetic number, because the mean of its divisors is an integer number (58049240648).

Almost surely, 2^633688386221 is an apocalyptic number.

It is an amenable number.

633688386221 is a deficient number, since it is larger than the sum of its proper divisors (62902501555).

633688386221 is a wasteful number, since it uses less digits than its factorization.

633688386221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431392 (or 431381 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 56.

The spelling of 633688386221 in words is "six hundred thirty-three billion, six hundred eighty-eight million, three hundred eighty-six thousand, two hundred twenty-one".