631113817802985 has 128 divisors (see below), whose sum is σ = 1296004621432320. Its totient is φ = 287988767539200.

The previous prime is 631113817802981. The next prime is 631113817802989. The reversal of 631113817802985 is 589208718311136.

It is a happy number.

631113817802985 is a `hidden beast` number, since 6 + 311 + 13 + 8 + 17 + 8 + 0 + 298 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (631113817802981) and next prime (631113817802989).

It is not a de Polignac number, because 631113817802985 - 2² = 631113817802981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631113817802981) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1314544839 + ... + 1315024851.

It is an arithmetic number, because the mean of its divisors is an integer number (10125036104940).

Almost surely, 2^{631113817802985} is an apocalyptic number.

It is an amenable number.

631113817802985 is an abundant number, since it is smaller than the sum of its proper divisors (664890803629335).

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

631113817802985 is a wasteful number, since it uses less digits than its factorization.

631113817802985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532136 (or 532130 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 63.

The spelling of 631113817802985 in words is "six hundred thirty-one trillion, one hundred thirteen billion, eight hundred seventeen million, eight hundred two thousand, nine hundred eighty-five".