265599997 has 4 divisors (see below), whose sum is σ = 286030780. Its totient is φ = 245169216.

The previous prime is 265599989. The next prime is 265600007. The reversal of 265599997 is 799995562.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 799995562 = 2 ⋅399997781.

It can be written as a sum of positive squares in 2 ways, for example, as 110124036 + 155475961 = 10494^2 + 12469^2 .

It is a cyclic number.

It is not a de Polignac number, because 265599997 - 2³ = 265599989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265599947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10215372 + ... + 10215397.

It is an arithmetic number, because the mean of its divisors is an integer number (71507695).

Almost surely, 2^265599997 is an apocalyptic number.

It is an amenable number.

265599997 is a deficient number, since it is larger than the sum of its proper divisors (20430783).

265599997 is a wasteful number, since it uses less digits than its factorization.

265599997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20430782.

The product of its digits is 13778100, while the sum is 61.

The square root of 265599997 is about 16297.2389379306. The cubic root of 265599997 is about 642.8002276972.

The spelling of 265599997 in words is "two hundred sixty-five million, five hundred ninety-nine thousand, nine hundred ninety-seven".