18871493471 has 8 divisors (see below), whose sum is σ = 19071905424. Its totient is φ = 18671667840.

The previous prime is 18871493447. The next prime is 18871493477. The reversal of 18871493471 is 17439417881.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18871493471 is a prime.

It is a super-3 number, since 3×18871493471³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18871493477) 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 7 ways as a sum of consecutive naturals, for example, 81716 + ... + 210761.

It is an arithmetic number, because the mean of its divisors is an integer number (2383988178).

Almost surely, 2^18871493471 is an apocalyptic number.

18871493471 is a deficient number, since it is larger than the sum of its proper divisors (200411953).

18871493471 is a wasteful number, since it uses less digits than its factorization.

18871493471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293161.

The product of its digits is 1354752, while the sum is 53.

The spelling of 18871493471 in words is "eighteen billion, eight hundred seventy-one million, four hundred ninety-three thousand, four hundred seventy-one".