16601994 has 12 divisors (see below), whose sum is σ = 35971026. Its totient is φ = 5533992.

The previous prime is 16601989. The next prime is 16602017. The reversal of 16601994 is 49910661.

It can be written as a sum of positive squares in only one way, i.e., 11471769 + 5130225 = 3387^2 + 2265^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 461149 + ... + 461184.

Almost surely, 2^16601994 is an apocalyptic number.

16601994 is an abundant number, since it is smaller than the sum of its proper divisors (19369032).

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

16601994 is a wasteful number, since it uses less digits than its factorization.

16601994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922341 (or 922338 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 16601994 is about 4074.5544541704. The cubic root of 16601994 is about 255.1056540269.

The spelling of 16601994 in words is "sixteen million, six hundred one thousand, nine hundred ninety-four".