7639006861 has 2 divisors, whose sum is σ = 7639006862. Its totient is φ = 7639006860.

The previous prime is 7639006849. The next prime is 7639006871. The reversal of 7639006861 is 1686009367.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5315284836 + 2323722025 = 72906^2 + 48205^2 .

It is a cyclic number.

It is not a de Polignac number, because 7639006861 - 2⁷ = 7639006733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7639006801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3819503430 + 3819503431.

It is an arithmetic number, because the mean of its divisors is an integer number (3819503431).

Almost surely, 2^7639006861 is an apocalyptic number.

It is an amenable number.

7639006861 is a deficient number, since it is larger than the sum of its proper divisors (1).

7639006861 is an equidigital number, since it uses as much as digits as its factorization.

7639006861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 7639006861 is about 87401.4122368741. The cubic root of 7639006861 is about 1969.4530558375.

The spelling of 7639006861 in words is "seven billion, six hundred thirty-nine million, six thousand, eight hundred sixty-one".