265979961 has 12 divisors (see below), whose sum is σ = 413746788. Its totient is φ = 163679904.

The previous prime is 265979933. The next prime is 265979963. The reversal of 265979961 is 169979562.

It can be written as a sum of positive squares in 2 ways, for example, as 27092025 + 238887936 = 5205^2 + 15456^2 .

It is not a de Polignac number, because 265979961 - 2⁵ = 265979929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 265979898 and 265979907.

It is not an unprimeable number, because it can be changed into a prime (265979963) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1136550 + ... + 1136783.

It is an arithmetic number, because the mean of its divisors is an integer number (34478899).

Almost surely, 2^265979961 is an apocalyptic number.

It is an amenable number.

265979961 is a deficient number, since it is larger than the sum of its proper divisors (147766827).

265979961 is a wasteful number, since it uses less digits than its factorization.

265979961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2273352 (or 2273349 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 54.

The square root of 265979961 is about 16308.8920837683. The cubic root of 265979961 is about 643.1066089367.

The spelling of 265979961 in words is "two hundred sixty-five million, nine hundred seventy-nine thousand, nine hundred sixty-one".