18994884551 has 8 divisors (see below), whose sum is σ = 19657242000. Its totient is φ = 18333017920.

The previous prime is 18994884529. The next prime is 18994884553. The reversal of 18994884551 is 15548849981.

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

It is a cyclic number.

It is not a de Polignac number, because 18994884551 - 2³⁰ = 17921142727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18994884553) 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, 43070 + ... + 199611.

It is an arithmetic number, because the mean of its divisors is an integer number (2457155250).

Almost surely, 2^18994884551 is an apocalyptic number.

18994884551 is a deficient number, since it is larger than the sum of its proper divisors (662357449).

18994884551 is a wasteful number, since it uses less digits than its factorization.

18994884551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245409.

The product of its digits is 16588800, while the sum is 62.

The spelling of 18994884551 in words is "eighteen billion, nine hundred ninety-four million, eight hundred eighty-four thousand, five hundred fifty-one".