18455723889 has 16 divisors (see below), whose sum is σ = 26061456960. Its totient is φ = 11577254400.

The previous prime is 18455723837. The next prime is 18455723933. The reversal of 18455723889 is 98832755481.

It is not a de Polignac number, because 18455723889 - 2⁷ = 18455723761 is a prime.

It is a super-2 number, since 2×18455723889² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18455323889) 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 15 ways as a sum of consecutive naturals, for example, 179589 + ... + 262989.

It is an arithmetic number, because the mean of its divisors is an integer number (1628841060).

Almost surely, 2^18455723889 is an apocalyptic number.

It is an amenable number.

18455723889 is a deficient number, since it is larger than the sum of its proper divisors (7605733071).

18455723889 is a wasteful number, since it uses less digits than its factorization.

18455723889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87760.

The product of its digits is 19353600, while the sum is 60.

The spelling of 18455723889 in words is "eighteen billion, four hundred fifty-five million, seven hundred twenty-three thousand, eight hundred eighty-nine".