811145665 has 8 divisors (see below), whose sum is σ = 1061863488. Its totient is φ = 589924080.

The previous prime is 811145641. The next prime is 811145737. The reversal of 811145665 is 566541118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 811145665 - 2¹¹ = 811143617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7373997 + ... + 7374106.

It is an arithmetic number, because the mean of its divisors is an integer number (132732936).

Almost surely, 2^811145665 is an apocalyptic number.

It is an amenable number.

811145665 is a deficient number, since it is larger than the sum of its proper divisors (250717823).

811145665 is a wasteful number, since it uses less digits than its factorization.

811145665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14748119.

The product of its digits is 28800, while the sum is 37.

The square root of 811145665 is about 28480.6191119505. The cubic root of 811145665 is about 932.6090320943.

The spelling of 811145665 in words is "eight hundred eleven million, one hundred forty-five thousand, six hundred sixty-five".