19966499 has 8 divisors (see below), whose sum is σ = 22901760. Its totient is φ = 17051976.

The previous prime is 19966477. The next prime is 19966519. The reversal of 19966499 is 99466991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19966499 is a prime.

It is a super-2 number, since 2×19966499² = 797322164634002, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19966499.

It is not an unprimeable number, because it can be changed into a prime (19966439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3059 + ... + 7020.

It is an arithmetic number, because the mean of its divisors is an integer number (2862720).

Almost surely, 2^19966499 is an apocalyptic number.

19966499 is a deficient number, since it is larger than the sum of its proper divisors (2935261).

19966499 is a wasteful number, since it uses less digits than its factorization.

19966499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10369.

The product of its digits is 944784, while the sum is 53.

The square root of 19966499 is about 4468.3888595332. The cubic root of 19966499 is about 271.2901174498.

The spelling of 19966499 in words is "nineteen million, nine hundred sixty-six thousand, four hundred ninety-nine".