7901997966449 has 2 divisors, whose sum is σ = 7901997966450. Its totient is φ = 7901997966448.

The previous prime is 7901997966427. The next prime is 7901997966463. The reversal of 7901997966449 is 9446697991097.

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., 5355637350625 + 2546360615824 = 2314225^2 + 1595732^2 .

It is a cyclic number.

It is not a de Polignac number, because 7901997966449 - 2³⁶ = 7833278489713 is a prime.

It is not a weakly prime, because it can be changed into another prime (7901997966469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3950998983224 + 3950998983225.

It is an arithmetic number, because the mean of its divisors is an integer number (3950998983225).

Almost surely, 2^{7901997966449} is an apocalyptic number.

It is an amenable number.

7901997966449 is a deficient number, since it is larger than the sum of its proper divisors (1).

7901997966449 is an equidigital number, since it uses as much as digits as its factorization.

7901997966449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1666598976, while the sum is 80.

The spelling of 7901997966449 in words is "seven trillion, nine hundred one billion, nine hundred ninety-seven million, nine hundred sixty-six thousand, four hundred forty-nine".