809296402661 has 2 divisors, whose sum is σ = 809296402662. Its totient is φ = 809296402660.

The previous prime is 809296402657. The next prime is 809296402741. The reversal of 809296402661 is 166204692908.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 700913886436 + 108382516225 = 837206^2 + 329215^2 .

It is a cyclic number.

It is not a de Polignac number, because 809296402661 - 2² = 809296402657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809296404661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404648201330 + 404648201331.

It is an arithmetic number, because the mean of its divisors is an integer number (404648201331).

Almost surely, 2^809296402661 is an apocalyptic number.

It is an amenable number.

809296402661 is a deficient number, since it is larger than the sum of its proper divisors (1).

809296402661 is an equidigital number, since it uses as much as digits as its factorization.

809296402661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 53.

The spelling of 809296402661 in words is "eight hundred nine billion, two hundred ninety-six million, four hundred two thousand, six hundred sixty-one".