521190686997 has 6 divisors (see below), whose sum is σ = 752830992342. Its totient is φ = 347460457992.

The previous prime is 521190686969. The next prime is 521190687001. The reversal of 521190686997 is 799686091125.

521190686997 is a `hidden beast` number, since 521 + 19 + 0 + 6 + 8 + 6 + 9 + 97 = 666.

It can be written as a sum of positive squares in only one way, i.e., 483093112401 + 38097574596 = 695049^2 + 195186^2 .

It is a de Polignac number, because none of the positive numbers 2^k-521190686997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521190286997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28955038158 + ... + 28955038175.

It is an arithmetic number, because the mean of its divisors is an integer number (125471832057).

Almost surely, 2^521190686997 is an apocalyptic number.

It is an amenable number.

521190686997 is a deficient number, since it is larger than the sum of its proper divisors (231640305345).

521190686997 is a wasteful number, since it uses less digits than its factorization.

521190686997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57910076339 (or 57910076336 counting only the distinct ones).

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

The spelling of 521190686997 in words is "five hundred twenty-one billion, one hundred ninety million, six hundred eighty-six thousand, nine hundred ninety-seven".