263391132761 has 2 divisors, whose sum is σ = 263391132762. Its totient is φ = 263391132760.

The previous prime is 263391132713. The next prime is 263391132773. The reversal of 263391132761 is 167231193362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261191522761 + 2199610000 = 511069^2 + 46900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263391132761 is a prime.

It is not a weakly prime, because it can be changed into another prime (263391132161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131695566380 + 131695566381.

It is an arithmetic number, because the mean of its divisors is an integer number (131695566381).

Almost surely, 2^263391132761 is an apocalyptic number.

It is an amenable number.

263391132761 is a deficient number, since it is larger than the sum of its proper divisors (1).

263391132761 is an equidigital number, since it uses as much as digits as its factorization.

263391132761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 44.

The spelling of 263391132761 in words is "two hundred sixty-three billion, three hundred ninety-one million, one hundred thirty-two thousand, seven hundred sixty-one".