631694320128 has 240 divisors, whose sum is σ = 1858753353600. Its totient is φ = 206466785280.

The previous prime is 631694320087. The next prime is 631694320129. The reversal of 631694320128 is 821023496136.

631694320128 is a `hidden beast` number, since 6 + 31 + 69 + 432 + 0 + 128 = 666.

It is a super-2 number, since 2×631694320128² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (631694320129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114455353 + ... + 114460871.

It is an arithmetic number, because the mean of its divisors is an integer number (7744805640).

Almost surely, 2^631694320128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631694320128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (929376676800).

631694320128 is an abundant number, since it is smaller than the sum of its proper divisors (1227059033472).

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

631694320128 is a wasteful number, since it uses less digits than its factorization.

631694320128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6023 (or 6004 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 631694320128 in words is "six hundred thirty-one billion, six hundred ninety-four million, three hundred twenty thousand, one hundred twenty-eight".