265779961481 has 2 divisors, whose sum is σ = 265779961482. Its totient is φ = 265779961480.

The previous prime is 265779961457. The next prime is 265779961483. The reversal of 265779961481 is 184169977562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202598111881 + 63181849600 = 450109^2 + 251360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265779961481 is a prime.

It is a super-2 number, since 2×265779961481² (a number of 24 digits) contains 22 as substring.

Together with 265779961483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (265779961483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132889980740 + 132889980741.

It is an arithmetic number, because the mean of its divisors is an integer number (132889980741).

Almost surely, 2^265779961481 is an apocalyptic number.

It is an amenable number.

265779961481 is a deficient number, since it is larger than the sum of its proper divisors (1).

265779961481 is an equidigital number, since it uses as much as digits as its factorization.

265779961481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45722880, while the sum is 65.

The spelling of 265779961481 in words is "two hundred sixty-five billion, seven hundred seventy-nine million, nine hundred sixty-one thousand, four hundred eighty-one".