18066453550 has 24 divisors (see below), whose sum is σ = 33614607456. Its totient is φ = 7224215040.

The previous prime is 18066453547. The next prime is 18066453577. The reversal of 18066453550 is 5535466081.

It is a junction number, because it is equal to n+sod(n) for n = 18066453497 and 18066453506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99259 + ... + 214441.

It is an arithmetic number, because the mean of its divisors is an integer number (1400608644).

Almost surely, 2^18066453550 is an apocalyptic number.

18066453550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18066453550 is a deficient number, since it is larger than the sum of its proper divisors (15548153906).

18066453550 is a wasteful number, since it uses less digits than its factorization.

18066453550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118332 (or 118327 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 18066453550 in words is "eighteen billion, sixty-six million, four hundred fifty-three thousand, five hundred fifty".