687699295873 has 2 divisors, whose sum is σ = 687699295874. Its totient is φ = 687699295872.

The previous prime is 687699295849. The next prime is 687699295897. The reversal of 687699295873 is 378592996786.

It is a balanced prime because it is at equal distance from previous prime (687699295849) and next prime (687699295897).

It can be written as a sum of positive squares in only one way, i.e., 543733688689 + 143965607184 = 737383^2 + 379428^2 .

It is a cyclic number.

It is not a de Polignac number, because 687699295873 - 2⁵ = 687699295841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 687699295793 and 687699295802.

It is not a weakly prime, because it can be changed into another prime (687699295813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343849647936 + 343849647937.

It is an arithmetic number, because the mean of its divisors is an integer number (343849647937).

Almost surely, 2^687699295873 is an apocalyptic number.

It is an amenable number.

687699295873 is a deficient number, since it is larger than the sum of its proper divisors (1).

687699295873 is an equidigital number, since it uses as much as digits as its factorization.

687699295873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2469035520, while the sum is 79.

The spelling of 687699295873 in words is "six hundred eighty-seven billion, six hundred ninety-nine million, two hundred ninety-five thousand, eight hundred seventy-three".