7686761491 has 2 divisors, whose sum is σ = 7686761492. Its totient is φ = 7686761490.

The previous prime is 7686761471. The next prime is 7686761521. The reversal of 7686761491 is 1941676867.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7686761491 is a prime.

It is not a weakly prime, because it can be changed into another prime (7686761441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3843380745 + 3843380746.

It is an arithmetic number, because the mean of its divisors is an integer number (3843380746).

Almost surely, 2^7686761491 is an apocalyptic number.

7686761491 is a deficient number, since it is larger than the sum of its proper divisors (1).

7686761491 is an equidigital number, since it uses as much as digits as its factorization.

7686761491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 55.

The square root of 7686761491 is about 87674.1780172475. The cubic root of 7686761491 is about 1973.5484920855.

The spelling of 7686761491 in words is "seven billion, six hundred eighty-six million, seven hundred sixty-one thousand, four hundred ninety-one".