78720477853 has 2 divisors, whose sum is σ = 78720477854. Its totient is φ = 78720477852.

The previous prime is 78720477851. The next prime is 78720477877. The reversal of 78720477853 is 35877402787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74047661689 + 4672816164 = 272117^2 + 68358^2 .

It is an emirp because it is prime and its reverse (35877402787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78720477853 - 2¹ = 78720477851 is a prime.

Together with 78720477851, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78720477851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39360238926 + 39360238927.

It is an arithmetic number, because the mean of its divisors is an integer number (39360238927).

Almost surely, 2^78720477853 is an apocalyptic number.

It is an amenable number.

78720477853 is a deficient number, since it is larger than the sum of its proper divisors (1).

78720477853 is an equidigital number, since it uses as much as digits as its factorization.

78720477853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18439680, while the sum is 58.

The spelling of 78720477853 in words is "seventy-eight billion, seven hundred twenty million, four hundred seventy-seven thousand, eight hundred fifty-three".