681277665287 has 2 divisors, whose sum is σ = 681277665288. Its totient is φ = 681277665286.

The previous prime is 681277665283. The next prime is 681277665329. The reversal of 681277665287 is 782566772186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681277665287 - 2² = 681277665283 is a prime.

It is a super-3 number, since 3×681277665287³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681277665281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340638832643 + 340638832644.

It is an arithmetic number, because the mean of its divisors is an integer number (340638832644).

Almost surely, 2^681277665287 is an apocalyptic number.

681277665287 is a deficient number, since it is larger than the sum of its proper divisors (1).

681277665287 is an equidigital number, since it uses as much as digits as its factorization.

681277665287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94832640, while the sum is 65.

The spelling of 681277665287 in words is "six hundred eighty-one billion, two hundred seventy-seven million, six hundred sixty-five thousand, two hundred eighty-seven".