521166457448 has 240 divisors, whose sum is σ = 1274486371200. Its totient is φ = 199486385280.

The previous prime is 521166457423. The next prime is 521166457459. The reversal of 521166457448 is 844754661125.

It is a super-2 number, since 2×521166457448² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 521166457448.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 100628123 + ... + 100633301.

It is an arithmetic number, because the mean of its divisors is an integer number (5310359880).

Almost surely, 2^521166457448 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 521166457448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (637243185600).

521166457448 is an abundant number, since it is smaller than the sum of its proper divisors (753319913752).

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

521166457448 is a wasteful number, since it uses less digits than its factorization.

521166457448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5270 (or 5232 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 53.

The spelling of 521166457448 in words is "five hundred twenty-one billion, one hundred sixty-six million, four hundred fifty-seven thousand, four hundred forty-eight".