631625505534 has 128 divisors (see below), whose sum is σ = 1539494812800. Its totient is φ = 191066480640.

The previous prime is 631625505461. The next prime is 631625505593. The reversal of 631625505534 is 435505526136.

631625505534 is a `hidden beast` number, since 6 + 3 + 1 + 62 + 5 + 50 + 5 + 534 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 631625505534.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20243754 + ... + 20274930.

It is an arithmetic number, because the mean of its divisors is an integer number (12027303225).

Almost surely, 2^631625505534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631625505534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (769747406400).

631625505534 is an abundant number, since it is smaller than the sum of its proper divisors (907869307266).

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

631625505534 is a wasteful number, since it uses less digits than its factorization.

631625505534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31995 (or 31989 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 45.

The spelling of 631625505534 in words is "six hundred thirty-one billion, six hundred twenty-five million, five hundred five thousand, five hundred thirty-four".