689091516877 has 2 divisors, whose sum is σ = 689091516878. Its totient is φ = 689091516876.

The previous prime is 689091516761. The next prime is 689091516917. The reversal of 689091516877 is 778615190986.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 681583987561 + 7507529316 = 825581^2 + 86646^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689091516877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689091516977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344545758438 + 344545758439.

It is an arithmetic number, because the mean of its divisors is an integer number (344545758439).

Almost surely, 2^689091516877 is an apocalyptic number.

It is an amenable number.

689091516877 is a deficient number, since it is larger than the sum of its proper divisors (1).

689091516877 is an equidigital number, since it uses as much as digits as its factorization.

689091516877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45722880, while the sum is 67.

The spelling of 689091516877 in words is "six hundred eighty-nine billion, ninety-one million, five hundred sixteen thousand, eight hundred seventy-seven".