18984477149 has 8 divisors (see below), whose sum is σ = 21270078048. Its totient is φ = 16792166160.

The previous prime is 18984477143. The next prime is 18984477179. The reversal of 18984477149 is 94177448981.

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

It is a de Polignac number, because none of the positive numbers 2^k-18984477149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18984477091 and 18984477100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18984477143) 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, 23322047 + ... + 23322860.

It is an arithmetic number, because the mean of its divisors is an integer number (2658759756).

Almost surely, 2^18984477149 is an apocalyptic number.

It is an amenable number.

18984477149 is a deficient number, since it is larger than the sum of its proper divisors (2285600899).

18984477149 is a wasteful number, since it uses less digits than its factorization.

18984477149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46644955.

The product of its digits is 16257024, while the sum is 62.

The spelling of 18984477149 in words is "eighteen billion, nine hundred eighty-four million, four hundred seventy-seven thousand, one hundred forty-nine".