680615161637 has 2 divisors, whose sum is σ = 680615161638. Its totient is φ = 680615161636.

The previous prime is 680615161543. The next prime is 680615161649. The reversal of 680615161637 is 736161516086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 423916885921 + 256698275716 = 651089^2 + 506654^2 .

It is a cyclic number.

It is not a de Polignac number, because 680615161637 - 2¹⁸ = 680614899493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680615161537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340307580818 + 340307580819.

It is an arithmetic number, because the mean of its divisors is an integer number (340307580819).

Almost surely, 2^680615161637 is an apocalyptic number.

It is an amenable number.

680615161637 is a deficient number, since it is larger than the sum of its proper divisors (1).

680615161637 is an equidigital number, since it uses as much as digits as its factorization.

680615161637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 680615161637 in words is "six hundred eighty billion, six hundred fifteen million, one hundred sixty-one thousand, six hundred thirty-seven".