775044665 has 4 divisors (see below), whose sum is σ = 930053604. Its totient is φ = 620035728.

The previous prime is 775044649. The next prime is 775044719. The reversal of 775044665 is 566440577.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566440577 = 4603 ⋅123059.

It can be written as a sum of positive squares in 2 ways, for example, as 389825536 + 385219129 = 19744^2 + 19627^2 .

It is a cyclic number.

It is not a de Polignac number, because 775044665 - 2⁴ = 775044649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77504462 + ... + 77504471.

It is an arithmetic number, because the mean of its divisors is an integer number (232513401).

Almost surely, 2^775044665 is an apocalyptic number.

It is an amenable number.

775044665 is a deficient number, since it is larger than the sum of its proper divisors (155008939).

775044665 is a wasteful number, since it uses less digits than its factorization.

775044665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155008938.

The product of its (nonzero) digits is 705600, while the sum is 44.

The square root of 775044665 is about 27839.6240096737. The cubic root of 775044665 is about 918.5629206142.

The spelling of 775044665 in words is "seven hundred seventy-five million, forty-four thousand, six hundred sixty-five".