631591068438 has 80 divisors (see below), whose sum is σ = 1546843548096. Its totient is φ = 191025002160.

The previous prime is 631591068431. The next prime is 631591068443. The reversal of 631591068438 is 834860195136.

631591068438 is a `hidden beast` number, since 6 + 3 + 1 + 591 + 0 + 6 + 8 + 43 + 8 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631591068431) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 593145 + ... + 1270827.

Almost surely, 2^631591068438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631591068438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (773421774048).

631591068438 is an abundant number, since it is smaller than the sum of its proper divisors (915252479658).

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

631591068438 is a wasteful number, since it uses less digits than its factorization.

631591068438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678231 (or 678222 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The spelling of 631591068438 in words is "six hundred thirty-one billion, five hundred ninety-one million, sixty-eight thousand, four hundred thirty-eight".