19666698 has 16 divisors (see below), whose sum is σ = 40690080. Its totient is φ = 6329456.

The previous prime is 19666681. The next prime is 19666709. The reversal of 19666698 is 89666691.

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 19666698.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56340 + ... + 56687.

It is an arithmetic number, because the mean of its divisors is an integer number (2543130).

Almost surely, 2^19666698 is an apocalyptic number.

19666698 is an abundant number, since it is smaller than the sum of its proper divisors (21023382).

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

19666698 is a wasteful number, since it uses less digits than its factorization.

19666698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113061.

The product of its digits is 839808, while the sum is 51.

The square root of 19666698 is about 4434.7150979516. The cubic root of 19666698 is about 269.9254389453.

The spelling of 19666698 in words is "nineteen million, six hundred sixty-six thousand, six hundred ninety-eight".