521798990904 has 128 divisors (see below), whose sum is σ = 1517627059200. Its totient is φ = 165802412160.

The previous prime is 521798990897. The next prime is 521798990957. The reversal of 521798990904 is 409099897125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1276389 + ... + 1634859.

It is an arithmetic number, because the mean of its divisors is an integer number (11856461400).

Almost surely, 2^521798990904 is an apocalyptic number.

521798990904 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521798990904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (758813529600).

521798990904 is an abundant number, since it is smaller than the sum of its proper divisors (995828068296).

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

521798990904 is a wasteful number, since it uses less digits than its factorization.

521798990904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358802 (or 358792 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 63.

The spelling of 521798990904 in words is "five hundred twenty-one billion, seven hundred ninety-eight million, nine hundred ninety thousand, nine hundred four".