78816172007 has 4 divisors (see below), whose sum is σ = 80946338856. Its totient is φ = 76686005160.

The previous prime is 78816171979. The next prime is 78816172031. The reversal of 78816172007 is 70027161887.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78816172007 - 2⁸ = 78816171751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78816172067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1065083369 + ... + 1065083442.

It is an arithmetic number, because the mean of its divisors is an integer number (20236584714).

Almost surely, 2^78816172007 is an apocalyptic number.

78816172007 is a deficient number, since it is larger than the sum of its proper divisors (2130166849).

78816172007 is a wasteful number, since it uses less digits than its factorization.

78816172007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2130166848.

The product of its (nonzero) digits is 263424, while the sum is 47.

The spelling of 78816172007 in words is "seventy-eight billion, eight hundred sixteen million, one hundred seventy-two thousand, seven".