521668676 has 12 divisors (see below), whose sum is σ = 913156608. Its totient is φ = 260766792.

The previous prime is 521668673. The next prime is 521668703. The reversal of 521668676 is 676866125.

It is a self number, because there is not a number n which added to its sum of digits gives 521668676.

It is not an unprimeable number, because it can be changed into a prime (521668673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3125 + ... + 32451.

It is an arithmetic number, because the mean of its divisors is an integer number (76096384).

Almost surely, 2^521668676 is an apocalyptic number.

It is an amenable number.

521668676 is a deficient number, since it is larger than the sum of its proper divisors (391487932).

521668676 is a wasteful number, since it uses less digits than its factorization.

521668676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33778 (or 33776 counting only the distinct ones).

The product of its digits is 725760, while the sum is 47.

The square root of 521668676 is about 22840.0673379042. The cubic root of 521668676 is about 805.0043984688.

The spelling of 521668676 in words is "five hundred twenty-one million, six hundred sixty-eight thousand, six hundred seventy-six".