19971018115 has 16 divisors (see below), whose sum is σ = 24036270336. Its totient is φ = 15929503200.

The previous prime is 19971018101. The next prime is 19971018127. The reversal of 19971018115 is 51181017991.

It is not a de Polignac number, because 19971018115 - 2⁷ = 19971017987 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4718050 + ... + 4722280.

It is an arithmetic number, because the mean of its divisors is an integer number (1502266896).

Almost surely, 2^19971018115 is an apocalyptic number.

19971018115 is a deficient number, since it is larger than the sum of its proper divisors (4065252221).

19971018115 is a wasteful number, since it uses less digits than its factorization.

19971018115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6810.

The product of its (nonzero) digits is 22680, while the sum is 43.

The spelling of 19971018115 in words is "nineteen billion, nine hundred seventy-one million, eighteen thousand, one hundred fifteen".