78790572989 has 2 divisors, whose sum is σ = 78790572990. Its totient is φ = 78790572988.

The previous prime is 78790572871. The next prime is 78790573007. The reversal of 78790572989 is 98927509787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42783612964 + 36006960025 = 206842^2 + 189755^2 .

It is an emirp because it is prime and its reverse (98927509787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78790572989 - 2⁸ = 78790572733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78790572689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39395286494 + 39395286495.

It is an arithmetic number, because the mean of its divisors is an integer number (39395286495).

Almost surely, 2^78790572989 is an apocalyptic number.

It is an amenable number.

78790572989 is a deficient number, since it is larger than the sum of its proper divisors (1).

78790572989 is an equidigital number, since it uses as much as digits as its factorization.

78790572989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160030080, while the sum is 71.

The spelling of 78790572989 in words is "seventy-eight billion, seven hundred ninety million, five hundred seventy-two thousand, nine hundred eighty-nine".