Search a number
-
+
18706010471 = 49138097781
BaseRepresentation
bin10001011010111101…
…110001000101100111
31210021122122210022122
4101122331301011213
5301302214313341
612332102420155
71231360315451
oct213275610547
953248583278
1018706010471
117a2a067595
12376073165b
1319c1595665
14c964cb2d1
1574736694b
hex45af71167

18706010471 has 4 divisors (see below), whose sum is σ = 18744108744. Its totient is φ = 18667912200.

The previous prime is 18706010431. The next prime is 18706010501. The reversal of 18706010471 is 17401060781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17401060781 = 131338543137.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-18706010471 is a prime.

It is a super-3 number, since 3×187060104713 (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 (18706010431) 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 3 ways as a sum of consecutive naturals, for example, 19048400 + ... + 19049381.

It is an arithmetic number, because the mean of its divisors is an integer number (4686027186).

Almost surely, 218706010471 is an apocalyptic number.

18706010471 is a deficient number, since it is larger than the sum of its proper divisors (38098273).

18706010471 is an equidigital number, since it uses as much as digits as its factorization.

18706010471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38098272.

The product of its (nonzero) digits is 9408, while the sum is 35.

The spelling of 18706010471 in words is "eighteen billion, seven hundred six million, ten thousand, four hundred seventy-one".

Divisors: 1 491 38097781 18706010471