78512179739 has 4 divisors (see below), whose sum is σ = 89728205424. Its totient is φ = 67296154056.

The previous prime is 78512179727. The next prime is 78512179741. The reversal of 78512179739 is 93797121587.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78512179739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78512179439) 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 3 ways as a sum of consecutive naturals, for example, 5608012832 + ... + 5608012845.

It is an arithmetic number, because the mean of its divisors is an integer number (22432051356).

Almost surely, 2^78512179739 is an apocalyptic number.

78512179739 is a deficient number, since it is larger than the sum of its proper divisors (11216025685).

78512179739 is a wasteful number, since it uses less digits than its factorization.

78512179739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11216025684.

The product of its digits is 6667920, while the sum is 59.

The spelling of 78512179739 in words is "seventy-eight billion, five hundred twelve million, one hundred seventy-nine thousand, seven hundred thirty-nine".