691758097769 has 2 divisors, whose sum is σ = 691758097770. Its totient is φ = 691758097768.

The previous prime is 691758097699. The next prime is 691758097837. The reversal of 691758097769 is 967790857196.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 691616773225 + 141324544 = 831635^2 + 11888^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691758097769 is a prime.

It is a super-2 number, since 2×691758097769² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 691758097696 and 691758097705.

It is not a weakly prime, because it can be changed into another prime (691758097969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345879048884 + 345879048885.

It is an arithmetic number, because the mean of its divisors is an integer number (345879048885).

Almost surely, 2^691758097769 is an apocalyptic number.

It is an amenable number.

691758097769 is a deficient number, since it is larger than the sum of its proper divisors (1).

691758097769 is an equidigital number, since it uses as much as digits as its factorization.

691758097769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360067680, while the sum is 74.

The spelling of 691758097769 in words is "six hundred ninety-one billion, seven hundred fifty-eight million, ninety-seven thousand, seven hundred sixty-nine".