78721161914 has 8 divisors (see below), whose sum is σ = 118764296820. Its totient is φ = 39133062976.

The previous prime is 78721161907. The next prime is 78721161917. The reversal of 78721161914 is 41916112787.

It can be written as a sum of positive squares in 2 ways, for example, as 57439312225 + 21281849689 = 239665^2 + 145883^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (78721161917) 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, 113758559 + ... + 113759250.

Almost surely, 2^78721161914 is an apocalyptic number.

78721161914 is a deficient number, since it is larger than the sum of its proper divisors (40043134906).

78721161914 is a wasteful number, since it uses less digits than its factorization.

78721161914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227517984.

The product of its digits is 169344, while the sum is 47.

The spelling of 78721161914 in words is "seventy-eight billion, seven hundred twenty-one million, one hundred sixty-one thousand, nine hundred fourteen".