631388905372 has 6 divisors (see below), whose sum is σ = 1104930584408. Its totient is φ = 315694452684.

The previous prime is 631388905369. The next prime is 631388905393. The reversal of 631388905372 is 273509883136.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78923613168 + ... + 78923613175.

Almost surely, 2^631388905372 is an apocalyptic number.

It is an amenable number.

631388905372 is a deficient number, since it is larger than the sum of its proper divisors (473541679036).

631388905372 is a wasteful number, since it uses less digits than its factorization.

631388905372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157847226347 (or 157847226345 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 631388905372 in words is "six hundred thirty-one billion, three hundred eighty-eight million, nine hundred five thousand, three hundred seventy-two".