78769721115 has 12 divisors (see below), whose sum is σ = 136534183344. Its totient is φ = 42010517904.

The previous prime is 78769721113. The next prime is 78769721137. The reversal of 78769721115 is 51112796787.

It is not a de Polignac number, because 78769721115 - 2¹ = 78769721113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78769721113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 875219079 + ... + 875219168.

It is an arithmetic number, because the mean of its divisors is an integer number (11377848612).

Almost surely, 2^78769721115 is an apocalyptic number.

78769721115 is a deficient number, since it is larger than the sum of its proper divisors (57764462229).

78769721115 is a wasteful number, since it uses less digits than its factorization.

78769721115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750438258 (or 1750438255 counting only the distinct ones).

The product of its digits is 1481760, while the sum is 54.

The spelling of 78769721115 in words is "seventy-eight billion, seven hundred sixty-nine million, seven hundred twenty-one thousand, one hundred fifteen".