689091516761 has 2 divisors, whose sum is σ = 689091516762. Its totient is φ = 689091516760.

The previous prime is 689091516713. The next prime is 689091516877. The reversal of 689091516761 is 167615190986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 486951356761 + 202140160000 = 697819^2 + 449600^2 .

It is a cyclic number.

It is not a de Polignac number, because 689091516761 - 2¹⁰ = 689091515737 is a prime.

It is a super-2 number, since 2×689091516761² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 689091516761.

It is not a weakly prime, because it can be changed into another prime (689091516161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344545758380 + 344545758381.

It is an arithmetic number, because the mean of its divisors is an integer number (344545758381).

Almost surely, 2^689091516761 is an apocalyptic number.

It is an amenable number.

689091516761 is a deficient number, since it is larger than the sum of its proper divisors (1).

689091516761 is an equidigital number, since it uses as much as digits as its factorization.

689091516761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4898880, while the sum is 59.

The spelling of 689091516761 in words is "six hundred eighty-nine billion, ninety-one million, five hundred sixteen thousand, seven hundred sixty-one".