521166503340 has 72 divisors (see below), whose sum is σ = 1806710549280. Its totient is φ = 119123771904.

The previous prime is 521166503239. The next prime is 521166503353. The reversal of 521166503340 is 43305661125.

521166503340 is a `hidden beast` number, since 5 + 2 + 116 + 6 + 503 + 34 + 0 = 666.

It is a super-2 number, since 2×521166503340² (a number of 24 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 521166503295 and 521166503304.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 206810845 + ... + 206813364.

Almost surely, 2^521166503340 is an apocalyptic number.

It is an amenable number.

521166503340 is an abundant number, since it is smaller than the sum of its proper divisors (1285544045940).

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

521166503340 is a wasteful number, since it uses less digits than its factorization.

521166503340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413624231 (or 413624226 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 521166503340 in words is "five hundred twenty-one billion, one hundred sixty-six million, five hundred three thousand, three hundred forty".