78700172845 has 16 divisors (see below), whose sum is σ = 109144385280. Its totient is φ = 53359473024.

The previous prime is 78700172839. The next prime is 78700172849. The reversal of 78700172845 is 54827100787.

It is a cyclic number.

It is not a de Polignac number, because 78700172845 - 2¹⁷ = 78700041773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78700172849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12629337 + ... + 12635566.

It is an arithmetic number, because the mean of its divisors is an integer number (6821524080).

Almost surely, 2^78700172845 is an apocalyptic number.

It is an amenable number.

78700172845 is a deficient number, since it is larger than the sum of its proper divisors (30444212435).

78700172845 is a wasteful number, since it uses less digits than its factorization.

78700172845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25265004.

The product of its (nonzero) digits is 878080, while the sum is 49.

The spelling of 78700172845 in words is "seventy-eight billion, seven hundred million, one hundred seventy-two thousand, eight hundred forty-five".