686501811937 has 2 divisors, whose sum is σ = 686501811938. Its totient is φ = 686501811936.

The previous prime is 686501811913. The next prime is 686501811973. The reversal of 686501811937 is 739118105686.

It is a happy number.

Together with next prime (686501811973) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 596739255121 + 89762556816 = 772489^2 + 299604^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686501811937 is a prime.

It is not a weakly prime, because it can be changed into another prime (686501811907) 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, 343250905968 + 343250905969.

It is an arithmetic number, because the mean of its divisors is an integer number (343250905969).

Almost surely, 2^686501811937 is an apocalyptic number.

It is an amenable number.

686501811937 is a deficient number, since it is larger than the sum of its proper divisors (1).

686501811937 is an equidigital number, since it uses as much as digits as its factorization.

686501811937 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2177280, while the sum is 55.

The spelling of 686501811937 in words is "six hundred eighty-six billion, five hundred one million, eight hundred eleven thousand, nine hundred thirty-seven".