18947165158 has 4 divisors (see below), whose sum is σ = 28420747740. Its totient is φ = 9473582578.

The previous prime is 18947165089. The next prime is 18947165177. The reversal of 18947165158 is 85156174981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85156174981 = 29137 ⋅2922613.

It is a junction number, because it is equal to n+sod(n) for n = 18947165099 and 18947165108.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4736791288 + ... + 4736791291.

It is an arithmetic number, because the mean of its divisors is an integer number (7105186935).

Almost surely, 2^18947165158 is an apocalyptic number.

18947165158 is a deficient number, since it is larger than the sum of its proper divisors (9473582582).

18947165158 is an equidigital number, since it uses as much as digits as its factorization.

18947165158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9473582581.

The product of its digits is 2419200, while the sum is 55.

The spelling of 18947165158 in words is "eighteen billion, nine hundred forty-seven million, one hundred sixty-five thousand, one hundred fifty-eight".