631127721136 has 80 divisors (see below), whose sum is σ = 1346416680960. Its totient is φ = 284202920960.

The previous prime is 631127721127. The next prime is 631127721167.

631127721136 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×631127721136² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50568945 + ... + 50581423.

It is an arithmetic number, because the mean of its divisors is an integer number (16830208512).

Almost surely, 2^631127721136 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 631127721136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (673208340480).

631127721136 is an abundant number, since it is smaller than the sum of its proper divisors (715288959824).

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

631127721136 is a wasteful number, since it uses less digits than its factorization.

631127721136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15154 (or 15148 counting only the distinct ones).

The product of its digits is 63504, while the sum is 40.

The spelling of 631127721136 in words is "six hundred thirty-one billion, one hundred twenty-seven million, seven hundred twenty-one thousand, one hundred thirty-six".