265544505445591 has 2 divisors, whose sum is σ = 265544505445592. Its totient is φ = 265544505445590.

The previous prime is 265544505445561. The next prime is 265544505445601. The reversal of 265544505445591 is 195544505445562.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 265544505445591 - 2⁷ = 265544505445463 is a prime.

It is a super-2 number, since 2×265544505445591² (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 (265544505445561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132772252722795 + 132772252722796.

It is an arithmetic number, because the mean of its divisors is an integer number (132772252722796).

Almost surely, 2^{265544505445591} is an apocalyptic number.

265544505445591 is a deficient number, since it is larger than the sum of its proper divisors (1).

265544505445591 is an equidigital number, since it uses as much as digits as its factorization.

265544505445591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432000000, while the sum is 64.

The spelling of 265544505445591 in words is "two hundred sixty-five trillion, five hundred forty-four billion, five hundred five million, four hundred forty-five thousand, five hundred ninety-one".