521142112660 has 72 divisors (see below), whose sum is σ = 1185363819360. Its totient is φ = 192372156288.

The previous prime is 521142112643. The next prime is 521142112661. The reversal of 521142112660 is 66211241125.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521142112661) 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, 14729271 + ... + 14764609.

It is an arithmetic number, because the mean of its divisors is an integer number (16463386380).

Almost surely, 2^521142112660 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 521142112660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (592681909680).

521142112660 is an abundant number, since it is smaller than the sum of its proper divisors (664221706700).

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

521142112660 is a wasteful number, since it uses less digits than its factorization.

521142112660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39737 (or 39722 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

Adding to 521142112660 its reverse (66211241125), we get a palindrome (587353353785).

The spelling of 521142112660 in words is "five hundred twenty-one billion, one hundred forty-two million, one hundred twelve thousand, six hundred sixty".