961265665 has 4 divisors (see below), whose sum is σ = 1153518804. Its totient is φ = 769012528.

The previous prime is 961265531. The next prime is 961265671. The reversal of 961265665 is 566562169.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566562169 = 31 ⋅18276199.

It can be written as a sum of positive squares in 2 ways, for example, as 624800016 + 336465649 = 24996^2 + 18343^2 .

It is a cyclic number.

It is not a de Polignac number, because 961265665 - 2²¹ = 959168513 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96126562 + ... + 96126571.

It is an arithmetic number, because the mean of its divisors is an integer number (288379701).

Almost surely, 2^961265665 is an apocalyptic number.

It is an amenable number.

961265665 is a deficient number, since it is larger than the sum of its proper divisors (192253139).

961265665 is a wasteful number, since it uses less digits than its factorization.

961265665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192253138.

The product of its digits is 583200, while the sum is 46.

The square root of 961265665 is about 31004.2846232581. The cubic root of 961265665 is about 986.9181668929.

The spelling of 961265665 in words is "nine hundred sixty-one million, two hundred sixty-five thousand, six hundred sixty-five".