265396681 has 9 divisors (see below), whose sum is σ = 291914119. Its totient is φ = 241106800.

The previous prime is 265396679. The next prime is 265396687. The reversal of 265396681 is 186693562.

The square root of 265396681 is 16291.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 113614281 + 151782400 = 10659^2 + 12320^2 .

It is not a de Polignac number, because 265396681 - 2¹ = 265396679 is a prime.

It is a super-2 number, since 2×265396681² = 140870796571631522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (265396687) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 178461 + ... + 179941.

Almost surely, 2^265396681 is an apocalyptic number.

265396681 is the 16291-st square number.

265396681 is the 8146-th centered octagonal number.

It is an amenable number.

265396681 is a deficient number, since it is larger than the sum of its proper divisors (26517438).

265396681 is an frugal number, since it uses more digits than its factorization.

265396681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2984 (or 1492 counting only the distinct ones).

The product of its digits is 466560, while the sum is 46.

The cubic root of 265396681 is about 642.6361652791.

The spelling of 265396681 in words is "two hundred sixty-five million, three hundred ninety-six thousand, six hundred eighty-one".