521991466475 has 6 divisors (see below), whose sum is σ = 647269418460. Its totient is φ = 417593173160.

The previous prime is 521991466457. The next prime is 521991466481. The reversal of 521991466475 is 574664199125.

It is not a de Polignac number, because 521991466475 - 2²² = 521987272171 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10439829305 + ... + 10439829354.

It is an arithmetic number, because the mean of its divisors is an integer number (107878236410).

Almost surely, 2^521991466475 is an apocalyptic number.

521991466475 is a deficient number, since it is larger than the sum of its proper divisors (125277951985).

521991466475 is a wasteful number, since it uses less digits than its factorization.

521991466475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20879658669 (or 20879658664 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 59.

The spelling of 521991466475 in words is "five hundred twenty-one billion, nine hundred ninety-one million, four hundred sixty-six thousand, four hundred seventy-five".