18664185450 has 48 divisors (see below), whose sum is σ = 48723354720. Its totient is φ = 4715161920.

The previous prime is 18664185439. The next prime is 18664185457. The reversal of 18664185450 is 5458146681.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18664185450.

It is not an unprimeable number, because it can be changed into a prime (18664185457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3271569 + ... + 3277268.

It is an arithmetic number, because the mean of its divisors is an integer number (1015069890).

Almost surely, 2^18664185450 is an apocalyptic number.

18664185450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18664185450 is an abundant number, since it is smaller than the sum of its proper divisors (30059169270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18664185450 is a wasteful number, since it uses less digits than its factorization.

18664185450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6548871 (or 6548866 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 48.

The spelling of 18664185450 in words is "eighteen billion, six hundred sixty-four million, one hundred eighty-five thousand, four hundred fifty".