768981240637 has 2 divisors, whose sum is σ = 768981240638. Its totient is φ = 768981240636.

The previous prime is 768981240607. The next prime is 768981240647. The reversal of 768981240637 is 736042189867.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 768797529721 + 183710916 = 876811^2 + 13554^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-768981240637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (768981240607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384490620318 + 384490620319.

It is an arithmetic number, because the mean of its divisors is an integer number (384490620319).

Almost surely, 2^768981240637 is an apocalyptic number.

It is an amenable number.

768981240637 is a deficient number, since it is larger than the sum of its proper divisors (1).

768981240637 is an equidigital number, since it uses as much as digits as its factorization.

768981240637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24385536, while the sum is 61.

The spelling of 768981240637 in words is "seven hundred sixty-eight billion, nine hundred eighty-one million, two hundred forty thousand, six hundred thirty-seven".