16218923889 has 16 divisors (see below), whose sum is σ = 25240393728. Its totient is φ = 9070765392.

The previous prime is 16218923881. The next prime is 16218923891. The reversal of 16218923889 is 98832981261.

It is a happy number.

It is not a de Polignac number, because 16218923889 - 2³ = 16218923881 is a prime.

It is a super-3 number, since 3×16218923889³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16218923881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8215287 + ... + 8217260.

It is an arithmetic number, because the mean of its divisors is an integer number (1577524608).

Almost surely, 2^16218923889 is an apocalyptic number.

It is an amenable number.

16218923889 is a deficient number, since it is larger than the sum of its proper divisors (9021469839).

16218923889 is a wasteful number, since it uses less digits than its factorization.

16218923889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16432604.

The product of its digits is 2985984, while the sum is 57.

The spelling of 16218923889 in words is "sixteen billion, two hundred eighteen million, nine hundred twenty-three thousand, eight hundred eighty-nine".