265991953 has 2 divisors, whose sum is σ = 265991954. Its totient is φ = 265991952.

The previous prime is 265991917. The next prime is 265991959. The reversal of 265991953 is 359199562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225961024 + 40030929 = 15032^2 + 6327^2 .

It is a cyclic number.

It is not a de Polignac number, because 265991953 - 2¹³ = 265983761 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 265991897 and 265991906.

It is not a weakly prime, because it can be changed into another prime (265991959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132995976 + 132995977.

It is an arithmetic number, because the mean of its divisors is an integer number (132995977).

Almost surely, 2^265991953 is an apocalyptic number.

It is an amenable number.

265991953 is a deficient number, since it is larger than the sum of its proper divisors (1).

265991953 is an equidigital number, since it uses as much as digits as its factorization.

265991953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 656100, while the sum is 49.

The square root of 265991953 is about 16309.2597318211. The cubic root of 265991953 is about 643.1162738485.

The spelling of 265991953 in words is "two hundred sixty-five million, nine hundred ninety-one thousand, nine hundred fifty-three".