696994956809 has 2 divisors, whose sum is σ = 696994956810. Its totient is φ = 696994956808.

The previous prime is 696994956803. The next prime is 696994956817. The reversal of 696994956809 is 908659499696.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 582889494784 + 114105462025 = 763472^2 + 337795^2 .

It is a cyclic number.

It is not a de Polignac number, because 696994956809 - 2²⁸ = 696726521353 is a prime.

It is not a weakly prime, because it can be changed into another prime (696994956803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348497478404 + 348497478405.

It is an arithmetic number, because the mean of its divisors is an integer number (348497478405).

Almost surely, 2^696994956809 is an apocalyptic number.

It is an amenable number.

696994956809 is a deficient number, since it is larger than the sum of its proper divisors (1).

696994956809 is an equidigital number, since it uses as much as digits as its factorization.

696994956809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2040733440, while the sum is 80.

The spelling of 696994956809 in words is "six hundred ninety-six billion, nine hundred ninety-four million, nine hundred fifty-six thousand, eight hundred nine".