78973996447 has 2 divisors, whose sum is σ = 78973996448. Its totient is φ = 78973996446.

The previous prime is 78973996441. The next prime is 78973996471. The reversal of 78973996447 is 74469937987.

It is a weak prime.

It is an emirp because it is prime and its reverse (74469937987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78973996447 - 2⁷ = 78973996319 is a prime.

It is a super-2 number, since 2×78973996447² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78973996447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78973996441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39486998223 + 39486998224.

It is an arithmetic number, because the mean of its divisors is an integer number (39486998224).

Almost surely, 2^78973996447 is an apocalyptic number.

78973996447 is a deficient number, since it is larger than the sum of its proper divisors (1).

78973996447 is an equidigital number, since it uses as much as digits as its factorization.

78973996447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576108288, while the sum is 73.

The spelling of 78973996447 in words is "seventy-eight billion, nine hundred seventy-three million, nine hundred ninety-six thousand, four hundred forty-seven".