78644044741 has 2 divisors, whose sum is σ = 78644044742. Its totient is φ = 78644044740.

The previous prime is 78644044681. The next prime is 78644044747. The reversal of 78644044741 is 14744044687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45601894116 + 33042150625 = 213546^2 + 181775^2 .

It is an emirp because it is prime and its reverse (14744044687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78644044741 - 2¹⁹ = 78643520453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78644044747) 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, 39322022370 + 39322022371.

It is an arithmetic number, because the mean of its divisors is an integer number (39322022371).

Almost surely, 2^78644044741 is an apocalyptic number.

It is an amenable number.

78644044741 is a deficient number, since it is larger than the sum of its proper divisors (1).

78644044741 is an equidigital number, since it uses as much as digits as its factorization.

78644044741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2408448, while the sum is 49.

The spelling of 78644044741 in words is "seventy-eight billion, six hundred forty-four million, forty-four thousand, seven hundred forty-one".