78071453309 has 2 divisors, whose sum is σ = 78071453310. Its totient is φ = 78071453308.

The previous prime is 78071453263. The next prime is 78071453311. The reversal of 78071453309 is 90335417087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61053468100 + 17017985209 = 247090^2 + 130453^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78071453309 is a prime.

Together with 78071453311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78071453329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39035726654 + 39035726655.

It is an arithmetic number, because the mean of its divisors is an integer number (39035726655).

Almost surely, 2^78071453309 is an apocalyptic number.

It is an amenable number.

78071453309 is a deficient number, since it is larger than the sum of its proper divisors (1).

78071453309 is an equidigital number, since it uses as much as digits as its factorization.

78071453309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 78071453309 in words is "seventy-eight billion, seventy-one million, four hundred fifty-three thousand, three hundred nine".