18454546999 has 4 divisors (see below), whose sum is σ = 21090910864. Its totient is φ = 15818183136.

The previous prime is 18454546991. The next prime is 18454547011. The reversal of 18454546999 is 99964545481.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18454546999 - 2³ = 18454546991 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18454546999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18454546991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1318181922 + ... + 1318181935.

It is an arithmetic number, because the mean of its divisors is an integer number (5272727716).

Almost surely, 2^18454546999 is an apocalyptic number.

18454546999 is a deficient number, since it is larger than the sum of its proper divisors (2636363865).

18454546999 is an equidigital number, since it uses as much as digits as its factorization.

18454546999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2636363864.

The product of its digits is 55987200, while the sum is 64.

The spelling of 18454546999 in words is "eighteen billion, four hundred fifty-four million, five hundred forty-six thousand, nine hundred ninety-nine".