265177783015261 has 2 divisors, whose sum is σ = 265177783015262. Its totient is φ = 265177783015260.

The previous prime is 265177783015121. The next prime is 265177783015267. The reversal of 265177783015261 is 162510387771562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218428004076100 + 46749778939161 = 14779310^2 + 6837381^2 .

It is a cyclic number.

It is not a de Polignac number, because 265177783015261 - 2²¹ = 265177780918109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 265177783015261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265177783015267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132588891507630 + 132588891507631.

It is an arithmetic number, because the mean of its divisors is an integer number (132588891507631).

Almost surely, 2^{265177783015261} is an apocalyptic number.

It is an amenable number.

265177783015261 is a deficient number, since it is larger than the sum of its proper divisors (1).

265177783015261 is an equidigital number, since it uses as much as digits as its factorization.

265177783015261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29635200, while the sum is 61.

The spelling of 265177783015261 in words is "two hundred sixty-five trillion, one hundred seventy-seven billion, seven hundred eighty-three million, fifteen thousand, two hundred sixty-one".