18657729223 has 32 divisors (see below), whose sum is σ = 22325760000. Its totient is φ = 15256200960.

The previous prime is 18657729199. The next prime is 18657729229. The reversal of 18657729223 is 32292775681.

It is a happy number.

It is not a de Polignac number, because 18657729223 - 2⁹ = 18657728711 is a prime.

It is a super-2 number, since 2×18657729223² (a number of 21 digits) contains 22 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 (18657729229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7318353 + ... + 7320901.

It is an arithmetic number, because the mean of its divisors is an integer number (697680000).

Almost surely, 2^18657729223 is an apocalyptic number.

18657729223 is a deficient number, since it is larger than the sum of its proper divisors (3668030777).

18657729223 is a wasteful number, since it uses less digits than its factorization.

18657729223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3055.

The product of its digits is 2540160, while the sum is 52.

The spelling of 18657729223 in words is "eighteen billion, six hundred fifty-seven million, seven hundred twenty-nine thousand, two hundred twenty-three".