697665866617 has 2 divisors, whose sum is σ = 697665866618. Its totient is φ = 697665866616.

The previous prime is 697665866593. The next prime is 697665866699. The reversal of 697665866617 is 716668566796.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 513366518016 + 184299348601 = 716496^2 + 429301^2 .

It is a cyclic number.

It is not a de Polignac number, because 697665866617 - 2¹¹ = 697665864569 is a prime.

It is a super-2 number, since 2×697665866617² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 697665866617.

It is not a weakly prime, because it can be changed into another prime (697665866017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348832933308 + 348832933309.

It is an arithmetic number, because the mean of its divisors is an integer number (348832933309).

Almost surely, 2^697665866617 is an apocalyptic number.

It is an amenable number.

697665866617 is a deficient number, since it is larger than the sum of its proper divisors (1).

697665866617 is an equidigital number, since it uses as much as digits as its factorization.

697665866617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 823011840, while the sum is 73.

The spelling of 697665866617 in words is "six hundred ninety-seven billion, six hundred sixty-five million, eight hundred sixty-six thousand, six hundred seventeen".