18910117471 has 8 divisors (see below), whose sum is σ = 21624222240. Its totient is φ = 16199177568.

The previous prime is 18910117427. The next prime is 18910117481. The reversal of 18910117471 is 17471101981.

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

It is not a de Polignac number, because 18910117471 - 2¹⁷ = 18909986399 is a prime.

It is a super-3 number, since 3×18910117471³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18910117481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 778396 + ... + 802321.

It is an arithmetic number, because the mean of its divisors is an integer number (2703027780).

Almost surely, 2^18910117471 is an apocalyptic number.

18910117471 is a deficient number, since it is larger than the sum of its proper divisors (2714104769).

18910117471 is a wasteful number, since it uses less digits than its factorization.

18910117471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1582433.

The product of its (nonzero) digits is 14112, while the sum is 40.

The spelling of 18910117471 in words is "eighteen billion, nine hundred ten million, one hundred seventeen thousand, four hundred seventy-one".