78787178499 has 16 divisors (see below), whose sum is σ = 105664759200. Its totient is φ = 52217383680.

The previous prime is 78787178423. The next prime is 78787178507. The reversal of 78787178499 is 99487178787.

It is not a de Polignac number, because 78787178499 - 2³² = 74492211203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78787178499.

It is not an unprimeable number, because it can be changed into a prime (78787178999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1746277 + ... + 1790825.

It is an arithmetic number, because the mean of its divisors is an integer number (6604047450).

Almost surely, 2^78787178499 is an apocalyptic number.

78787178499 is a deficient number, since it is larger than the sum of its proper divisors (26877580701).

78787178499 is a wasteful number, since it uses less digits than its factorization.

78787178499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47990.

The product of its digits is 398297088, while the sum is 75.

The spelling of 78787178499 in words is "seventy-eight billion, seven hundred eighty-seven million, one hundred seventy-eight thousand, four hundred ninety-nine".