18668650 has 96 divisors (see below), whose sum is σ = 46747008. Its totient is φ = 5356800.

The previous prime is 18668641. The next prime is 18668687. The reversal of 18668650 is 5686681.

18668650 = T₁₁₁ + T₁₁₂ + ... + T₄₈₃.

18668650 = 803² + 804² + ... + 830².

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49864 + ... + 50236.

It is an arithmetic number, because the mean of its divisors is an integer number (486948).

Almost surely, 2^18668650 is an apocalyptic number.

18668650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18668650 is an abundant number, since it is smaller than the sum of its proper divisors (28078358).

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

18668650 is a wasteful number, since it uses less digits than its factorization.

18668650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 18668650 is about 4320.7233190752. The cubic root of 18668650 is about 265.2798751899.

The spelling of 18668650 in words is "eighteen million, six hundred sixty-eight thousand, six hundred fifty".