811426661 has 4 divisors (see below), whose sum is σ = 826736652. Its totient is φ = 796116672.

The previous prime is 811426657. The next prime is 811426663. The reversal of 811426661 is 166624118.

811426661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 230857636 + 580569025 = 15194^2 + 24095^2 .

It is a cyclic number.

It is not a de Polignac number, because 811426661 - 2² = 811426657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811426663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7654916 + ... + 7655021.

It is an arithmetic number, because the mean of its divisors is an integer number (206684163).

Almost surely, 2^811426661 is an apocalyptic number.

It is an amenable number.

811426661 is a deficient number, since it is larger than the sum of its proper divisors (15309991).

811426661 is a wasteful number, since it uses less digits than its factorization.

811426661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15309990.

The product of its digits is 13824, while the sum is 35.

The square root of 811426661 is about 28485.5517938481. The cubic root of 811426661 is about 932.7167107205.

The spelling of 811426661 in words is "eight hundred eleven million, four hundred twenty-six thousand, six hundred sixty-one".