521752716225691 has 2 divisors, whose sum is σ = 521752716225692. Its totient is φ = 521752716225690.

The previous prime is 521752716225667. The next prime is 521752716225737. The reversal of 521752716225691 is 196522617257125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521752716225691 - 2⁵ = 521752716225659 is a prime.

It is not a weakly prime, because it can be changed into another prime (521752716225491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260876358112845 + 260876358112846.

It is an arithmetic number, because the mean of its divisors is an integer number (260876358112846).

Almost surely, 2^{521752716225691} is an apocalyptic number.

521752716225691 is a deficient number, since it is larger than the sum of its proper divisors (1).

521752716225691 is an equidigital number, since it uses as much as digits as its factorization.

521752716225691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752000, while the sum is 61.

The spelling of 521752716225691 in words is "five hundred twenty-one trillion, seven hundred fifty-two billion, seven hundred sixteen million, two hundred twenty-five thousand, six hundred ninety-one".