631998381654 has 48 divisors (see below), whose sum is σ = 1419992669472. Its totient is φ = 202982402304.

The previous prime is 631998381611. The next prime is 631998381671. The reversal of 631998381654 is 456183899136.

631998381654 is a `hidden beast` number, since 6 + 3 + 199 + 8 + 381 + 65 + 4 = 666.

631998381654 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 631998381591 and 631998381600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4537939 + ... + 4675134.

It is an arithmetic number, because the mean of its divisors is an integer number (29583180614).

Almost surely, 2^631998381654 is an apocalyptic number.

631998381654 is an abundant number, since it is smaller than the sum of its proper divisors (787994287818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631998381654 is a wasteful number, since it uses less digits than its factorization.

631998381654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9213221 (or 9213218 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 63.

The spelling of 631998381654 in words is "six hundred thirty-one billion, nine hundred ninety-eight million, three hundred eighty-one thousand, six hundred fifty-four".