18115957071 has 20 divisors (see below), whose sum is σ = 27071387112. Its totient is φ = 12073164048.

The previous prime is 18115957049. The next prime is 18115957087. The reversal of 18115957071 is 17075951181.

18115957071 is a `hidden beast` number, since 1 + 8 + 1 + 1 + 5 + 9 + 570 + 71 = 666.

It is not a de Polignac number, because 18115957071 - 2⁵ = 18115957039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18115957471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 209176 + ... + 282818.

Almost surely, 2^18115957071 is an apocalyptic number.

18115957071 is a deficient number, since it is larger than the sum of its proper divisors (8955430041).

18115957071 is an equidigital number, since it uses as much as digits as its factorization.

18115957071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76692 (or 76683 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 45.

The spelling of 18115957071 in words is "eighteen billion, one hundred fifteen million, nine hundred fifty-seven thousand, seventy-one".