686467855081 has 2 divisors, whose sum is σ = 686467855082. Its totient is φ = 686467855080.

The previous prime is 686467855079. The next prime is 686467855133. The reversal of 686467855081 is 180558764686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 524494608400 + 161973246681 = 724220^2 + 402459^2 .

It is a cyclic number.

It is not a de Polignac number, because 686467855081 - 2¹ = 686467855079 is a prime.

It is a super-2 number, since 2×686467855081² (a number of 24 digits) contains 22 as substring.

Together with 686467855079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (686467855481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343233927540 + 343233927541.

It is an arithmetic number, because the mean of its divisors is an integer number (343233927541).

Almost surely, 2^686467855081 is an apocalyptic number.

It is an amenable number.

686467855081 is a deficient number, since it is larger than the sum of its proper divisors (1).

686467855081 is an equidigital number, since it uses as much as digits as its factorization.

686467855081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77414400, while the sum is 64.

The spelling of 686467855081 in words is "six hundred eighty-six billion, four hundred sixty-seven million, eight hundred fifty-five thousand, eighty-one".