523131042636 has 144 divisors (see below), whose sum is σ = 1372320302080. Its totient is φ = 167894415360.

The previous prime is 523131042529. The next prime is 523131042667. The reversal of 523131042636 is 636240131325.

523131042636 is a `hidden beast` number, since 5 + 2 + 3 + 1 + 3 + 10 + 4 + 2 + 636 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 523131042636.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 69184296 + ... + 69191856.

Almost surely, 2^523131042636 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 523131042636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (686160151040).

523131042636 is an abundant number, since it is smaller than the sum of its proper divisors (849189259444).

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

523131042636 is a wasteful number, since it uses less digits than its factorization.

523131042636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8144 (or 8139 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The spelling of 523131042636 in words is "five hundred twenty-three billion, one hundred thirty-one million, forty-two thousand, six hundred thirty-six".