697609699475669 has 2 divisors, whose sum is σ = 697609699475670. Its totient is φ = 697609699475668.

The previous prime is 697609699475651. The next prime is 697609699475681. The reversal of 697609699475669 is 966574996906796.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 536231041295569 + 161378658180100 = 23156663^2 + 12703490^2 .

It is a cyclic number.

It is not a de Polignac number, because 697609699475669 - 2²⁸ = 697609431040213 is a prime.

It is a super-2 number, since 2×697609699475669² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (697609699475699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348804849737834 + 348804849737835.

It is an arithmetic number, because the mean of its divisors is an integer number (348804849737835).

Almost surely, 2^{697609699475669} is an apocalyptic number.

It is an amenable number.

697609699475669 is a deficient number, since it is larger than the sum of its proper divisors (1).

697609699475669 is an equidigital number, since it uses as much as digits as its factorization.

697609699475669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 449981723520, while the sum is 98.

The spelling of 697609699475669 in words is "six hundred ninety-seven trillion, six hundred nine billion, six hundred ninety-nine million, four hundred seventy-five thousand, six hundred sixty-nine".