18663730545 has 8 divisors (see below), whose sum is σ = 29861968896. Its totient is φ = 9953989616.

The previous prime is 18663730543. The next prime is 18663730559. The reversal of 18663730545 is 54503736681.

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 18663730545 - 2¹ = 18663730543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18663730494 and 18663730503.

It is not an unprimeable number, because it can be changed into a prime (18663730543) 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, 622124337 + ... + 622124366.

It is an arithmetic number, because the mean of its divisors is an integer number (3732746112).

Almost surely, 2^18663730545 is an apocalyptic number.

18663730545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18663730545 is a deficient number, since it is larger than the sum of its proper divisors (11198238351).

18663730545 is a wasteful number, since it uses less digits than its factorization.

18663730545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244248711.

The product of its (nonzero) digits is 1814400, while the sum is 48.

The spelling of 18663730545 in words is "eighteen billion, six hundred sixty-three million, seven hundred thirty thousand, five hundred forty-five".