71287994868449 has 2 divisors, whose sum is σ = 71287994868450. Its totient is φ = 71287994868448.

The previous prime is 71287994868397. The next prime is 71287994868491. The reversal of 71287994868449 is 94486849978217.

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., 47970376384225 + 23317618484224 = 6926065^2 + 4828832^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71287994868449 is a prime.

It is not a weakly prime, because it can be changed into another prime (71287994868949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35643997434224 + 35643997434225.

It is an arithmetic number, because the mean of its divisors is an integer number (35643997434225).

Almost surely, 2^{71287994868449} is an apocalyptic number.

It is an amenable number.

71287994868449 is a deficient number, since it is larger than the sum of its proper divisors (1).

71287994868449 is an equidigital number, since it uses as much as digits as its factorization.

71287994868449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14046068736, while the sum is 86.

The spelling of 71287994868449 in words is "seventy-one trillion, two hundred eighty-seven billion, nine hundred ninety-four million, eight hundred sixty-eight thousand, four hundred forty-nine".