7919646689 has 2 divisors, whose sum is σ = 7919646690. Its totient is φ = 7919646688.

The previous prime is 7919646667. The next prime is 7919646767. The reversal of 7919646689 is 9866469197.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5186448289 + 2733198400 = 72017^2 + 52280^2 .

It is a cyclic number.

It is not a de Polignac number, because 7919646689 - 2⁸ = 7919646433 is a prime.

It is not a weakly prime, because it can be changed into another prime (7919648689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3959823344 + 3959823345.

It is an arithmetic number, because the mean of its divisors is an integer number (3959823345).

Almost surely, 2^7919646689 is an apocalyptic number.

It is an amenable number.

7919646689 is a deficient number, since it is larger than the sum of its proper divisors (1).

7919646689 is an equidigital number, since it uses as much as digits as its factorization.

7919646689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35271936, while the sum is 65.

The square root of 7919646689 is about 88992.3968044462. The cubic root of 7919646689 is about 1993.2813458668.

The spelling of 7919646689 in words is "seven billion, nine hundred nineteen million, six hundred forty-six thousand, six hundred eighty-nine".