18543648772 has 12 divisors (see below), whose sum is σ = 35401511376. Its totient is φ = 8428931240.

The previous prime is 18543648757. The next prime is 18543648791. The reversal of 18543648772 is 27784634581.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210723238 + ... + 210723325.

It is an arithmetic number, because the mean of its divisors is an integer number (2950125948).

Almost surely, 2^18543648772 is an apocalyptic number.

It is an amenable number.

18543648772 is a deficient number, since it is larger than the sum of its proper divisors (16857862604).

18543648772 is a wasteful number, since it uses less digits than its factorization.

18543648772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421446578 (or 421446576 counting only the distinct ones).

The product of its digits is 9031680, while the sum is 55.

The spelling of 18543648772 in words is "eighteen billion, five hundred forty-three million, six hundred forty-eight thousand, seven hundred seventy-two".