8139966449 has 2 divisors, whose sum is σ = 8139966450. Its totient is φ = 8139966448.

The previous prime is 8139966431. The next prime is 8139966451. The reversal of 8139966449 is 9446699318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6344919025 + 1795047424 = 79655^2 + 42368^2 .

It is a cyclic number.

It is not a de Polignac number, because 8139966449 - 2⁸ = 8139966193 is a prime.

Together with 8139966451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8139962449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4069983224 + 4069983225.

It is an arithmetic number, because the mean of its divisors is an integer number (4069983225).

Almost surely, 2^8139966449 is an apocalyptic number.

It is an amenable number.

8139966449 is a deficient number, since it is larger than the sum of its proper divisors (1).

8139966449 is an equidigital number, since it uses as much as digits as its factorization.

8139966449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10077696, while the sum is 59.

The square root of 8139966449 is about 90221.7626130193. The cubic root of 8139966449 is about 2011.5965013710.

The spelling of 8139966449 in words is "eight billion, one hundred thirty-nine million, nine hundred sixty-six thousand, four hundred forty-nine".