680703637 has 2 divisors, whose sum is σ = 680703638. Its totient is φ = 680703636.

The previous prime is 680703623. The next prime is 680703659. The reversal of 680703637 is 736307086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 663114001 + 17589636 = 25751^2 + 4194^2 .

It is a cyclic number.

It is not a de Polignac number, because 680703637 - 2⁷ = 680703509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 680703637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680703677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340351818 + 340351819.

It is an arithmetic number, because the mean of its divisors is an integer number (340351819).

Almost surely, 2^680703637 is an apocalyptic number.

It is an amenable number.

680703637 is a deficient number, since it is larger than the sum of its proper divisors (1).

680703637 is an equidigital number, since it uses as much as digits as its factorization.

680703637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 680703637 is about 26090.2977560625. The cubic root of 680703637 is about 879.6691408580.

The spelling of 680703637 in words is "six hundred eighty million, seven hundred three thousand, six hundred thirty-seven".