7639948657849 has 2 divisors, whose sum is σ = 7639948657850. Its totient is φ = 7639948657848.

The previous prime is 7639948657763. The next prime is 7639948657907. The reversal of 7639948657849 is 9487568499367.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6948722697849 + 691225960000 = 2636043^2 + 831400^2 .

It is a cyclic number.

It is not a de Polignac number, because 7639948657849 - 2⁹ = 7639948657337 is a prime.

It is not a weakly prime, because it can be changed into another prime (7639948057849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3819974328924 + 3819974328925.

It is an arithmetic number, because the mean of its divisors is an integer number (3819974328925).

Almost surely, 2^{7639948657849} is an apocalyptic number.

It is an amenable number.

7639948657849 is a deficient number, since it is larger than the sum of its proper divisors (1).

7639948657849 is an equidigital number, since it uses as much as digits as its factorization.

7639948657849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19752284160, while the sum is 85.

The spelling of 7639948657849 in words is "seven trillion, six hundred thirty-nine billion, nine hundred forty-eight million, six hundred fifty-seven thousand, eight hundred forty-nine".