680999687 has 2 divisors, whose sum is σ = 680999688. Its totient is φ = 680999686.

The previous prime is 680999677. The next prime is 680999717. The reversal of 680999687 is 786999086.

680999687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 680999687 - 2¹⁶ = 680934151 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680999677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340499843 + 340499844.

It is an arithmetic number, because the mean of its divisors is an integer number (340499844).

Almost surely, 2^680999687 is an apocalyptic number.

680999687 is a deficient number, since it is larger than the sum of its proper divisors (1).

680999687 is an equidigital number, since it uses as much as digits as its factorization.

680999687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11757312, while the sum is 62.

The square root of 680999687 is about 26095.9707043061. The cubic root of 680999687 is about 879.7966502417.

The spelling of 680999687 in words is "six hundred eighty million, nine hundred ninety-nine thousand, six hundred eighty-seven".