687699295897 has 2 divisors, whose sum is σ = 687699295898. Its totient is φ = 687699295896.

The previous prime is 687699295873. The next prime is 687699295957. The reversal of 687699295897 is 798592996786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 541503185161 + 146196110736 = 735869^2 + 382356^2 .

It is a cyclic number.

It is not a de Polignac number, because 687699295897 - 2⁷ = 687699295769 is a prime.

It is a super-2 number, since 2×687699295897² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (687699295807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343849647948 + 343849647949.

It is an arithmetic number, because the mean of its divisors is an integer number (343849647949).

Almost surely, 2^687699295897 is an apocalyptic number.

It is an amenable number.

687699295897 is a deficient number, since it is larger than the sum of its proper divisors (1).

687699295897 is an equidigital number, since it uses as much as digits as its factorization.

687699295897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7407106560, while the sum is 85.

The spelling of 687699295897 in words is "six hundred eighty-seven billion, six hundred ninety-nine million, two hundred ninety-five thousand, eight hundred ninety-seven".