78731610018 has 16 divisors (see below), whose sum is σ = 157467079296. Its totient is φ = 26243226800.

The previous prime is 78731609963. The next prime is 78731610059. The reversal of 78731610018 is 81001613787.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150880 + ... + 424532.

It is an arithmetic number, because the mean of its divisors is an integer number (9841692456).

Almost surely, 2^78731610018 is an apocalyptic number.

78731610018 is an abundant number, since it is smaller than the sum of its proper divisors (78735469278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78731610018 is a wasteful number, since it uses less digits than its factorization.

78731610018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321609.

The product of its (nonzero) digits is 56448, while the sum is 42.

The spelling of 78731610018 in words is "seventy-eight billion, seven hundred thirty-one million, six hundred ten thousand, eighteen".