78745218249 has 16 divisors (see below), whose sum is σ = 110769120000. Its totient is φ = 49621540176.

The previous prime is 78745218247. The next prime is 78745218257. The reversal of 78745218249 is 94281254787.

It is not a de Polignac number, because 78745218249 - 2¹ = 78745218247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (78745218241) 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 in 15 ways as a sum of consecutive naturals, for example, 1533999 + ... + 1584500.

It is an arithmetic number, because the mean of its divisors is an integer number (6923070000).

Almost surely, 2^78745218249 is an apocalyptic number.

It is an amenable number.

78745218249 is a deficient number, since it is larger than the sum of its proper divisors (32023901751).

78745218249 is a wasteful number, since it uses less digits than its factorization.

78745218249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3118964.

The product of its digits is 9031680, while the sum is 57.

The spelling of 78745218249 in words is "seventy-eight billion, seven hundred forty-five million, two hundred eighteen thousand, two hundred forty-nine".