18864437249 has 8 divisors (see below), whose sum is σ = 22060737600. Its totient is φ = 15793482096.

The previous prime is 18864437231. The next prime is 18864437257. The reversal of 18864437249 is 94273446881.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18864437249 - 2³² = 14569469953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18864437194 and 18864437203.

It is not an unprimeable number, because it can be changed into a prime (18864437269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31335974 + ... + 31336575.

It is an arithmetic number, because the mean of its divisors is an integer number (2757592200).

Almost surely, 2^18864437249 is an apocalyptic number.

It is an amenable number.

18864437249 is a deficient number, since it is larger than the sum of its proper divisors (3196300351).

18864437249 is an equidigital number, since it uses as much as digits as its factorization.

18864437249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62672599.

The product of its digits is 9289728, while the sum is 56.

The spelling of 18864437249 in words is "eighteen billion, eight hundred sixty-four million, four hundred thirty-seven thousand, two hundred forty-nine".