265644164142397 has 2 divisors, whose sum is σ = 265644164142398. Its totient is φ = 265644164142396.

The previous prime is 265644164142337. The next prime is 265644164142431. The reversal of 265644164142397 is 793241461446562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 234567787147236 + 31076376995161 = 15315606^2 + 5574619^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265644164142397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265644164142307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132822082071198 + 132822082071199.

It is an arithmetic number, because the mean of its divisors is an integer number (132822082071199).

Almost surely, 2^{265644164142397} is an apocalyptic number.

It is an amenable number.

265644164142397 is a deficient number, since it is larger than the sum of its proper divisors (1).

265644164142397 is an equidigital number, since it uses as much as digits as its factorization.

265644164142397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209018880, while the sum is 64.

The spelling of 265644164142397 in words is "two hundred sixty-five trillion, six hundred forty-four billion, one hundred sixty-four million, one hundred forty-two thousand, three hundred ninety-seven".