265643144621431 has 2 divisors, whose sum is σ = 265643144621432. Its totient is φ = 265643144621430.

The previous prime is 265643144621383. The next prime is 265643144621443. The reversal of 265643144621431 is 134126441346562.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 265643144621431 - 2⁷ = 265643144621303 is a prime.

It is a super-2 number, since 2×265643144621431² (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 (265643144661431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132821572310715 + 132821572310716.

It is an arithmetic number, because the mean of its divisors is an integer number (132821572310716).

Almost surely, 2^{265643144621431} is an apocalyptic number.

265643144621431 is a deficient number, since it is larger than the sum of its proper divisors (1).

265643144621431 is an equidigital number, since it uses as much as digits as its factorization.

265643144621431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9953280, while the sum is 52.

Adding to 265643144621431 its reverse (134126441346562), we get a palindrome (399769585967993).

The spelling of 265643144621431 in words is "two hundred sixty-five trillion, six hundred forty-three billion, one hundred forty-four million, six hundred twenty-one thousand, four hundred thirty-one".