18188966450 has 18 divisors (see below), whose sum is σ = 33833251479. Its totient is φ = 7275205120.

The previous prime is 18188966423. The next prime is 18188966459. The reversal of 18188966450 is 5466988181.

It can be written as a sum of positive squares in 5 ways, for example, as 15499969 + 18173466481 = 3937^2 + 134809^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=95365.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18188966459) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 944114 + ... + 963186.

Almost surely, 2^18188966450 is an apocalyptic number.

18188966450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18188966450 is a deficient number, since it is larger than the sum of its proper divisors (15644285029).

18188966450 is an frugal number, since it uses more digits than its factorization.

18188966450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38158 (or 19080 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 56.

The spelling of 18188966450 in words is "eighteen billion, one hundred eighty-eight million, nine hundred sixty-six thousand, four hundred fifty".