18772847909 has 8 divisors (see below), whose sum is σ = 19388428800. Its totient is φ = 18157892400.

The previous prime is 18772847897. The next prime is 18772847911. The reversal of 18772847909 is 90974827781.

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 18772847909 - 2⁴ = 18772847893 is a prime.

It is a super-2 number, since 2×18772847909² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18772847969) 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, 94937 + ... + 215774.

It is an arithmetic number, because the mean of its divisors is an integer number (2423553600).

Almost surely, 2^18772847909 is an apocalyptic number.

It is an amenable number.

18772847909 is a deficient number, since it is larger than the sum of its proper divisors (615580891).

18772847909 is a wasteful number, since it uses less digits than its factorization.

18772847909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312691.

The product of its (nonzero) digits is 14224896, while the sum is 62.

The spelling of 18772847909 in words is "eighteen billion, seven hundred seventy-two million, eight hundred forty-seven thousand, nine hundred nine".