431367566681 has 2 divisors, whose sum is σ = 431367566682. Its totient is φ = 431367566680.

The previous prime is 431367566659. The next prime is 431367566689. The reversal of 431367566681 is 186665763134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 316866542281 + 114501024400 = 562909^2 + 338380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431367566681 is a prime.

It is a super-2 number, since 2×431367566681² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (431367566689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215683783340 + 215683783341.

It is an arithmetic number, because the mean of its divisors is an integer number (215683783341).

Almost surely, 2^431367566681 is an apocalyptic number.

It is an amenable number.

431367566681 is a deficient number, since it is larger than the sum of its proper divisors (1).

431367566681 is an equidigital number, since it uses as much as digits as its factorization.

431367566681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 56.

The spelling of 431367566681 in words is "four hundred thirty-one billion, three hundred sixty-seven million, five hundred sixty-six thousand, six hundred eighty-one".