265643144661431 has 2 divisors, whose sum is σ = 265643144661432. Its totient is φ = 265643144661430.

The previous prime is 265643144661413. The next prime is 265643144661497. The reversal of 265643144661431 is 134166441346562.

Together with previous prime (265643144661413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 265643144661431 - 2¹⁸ = 265643144399287 is a prime.

It is a super-2 number, since 2×265643144661431² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265643144669431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132821572330715 + 132821572330716.

It is an arithmetic number, because the mean of its divisors is an integer number (132821572330716).

Almost surely, 2^{265643144661431} is an apocalyptic number.

265643144661431 is a deficient number, since it is larger than the sum of its proper divisors (1).

265643144661431 is an equidigital number, since it uses as much as digits as its factorization.

265643144661431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29859840, while the sum is 56.

The spelling of 265643144661431 in words is "two hundred sixty-five trillion, six hundred forty-three billion, one hundred forty-four million, six hundred sixty-one thousand, four hundred thirty-one".