16620199 has 4 divisors (see below), whose sum is σ = 16632864. Its totient is φ = 16607536.

The previous prime is 16620173. The next prime is 16620209. The reversal of 16620199 is 99102661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99102661 = 7 ⋅14157523.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16620199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16620119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4102 + ... + 7075.

It is an arithmetic number, because the mean of its divisors is an integer number (4158216).

Almost surely, 2^16620199 is an apocalyptic number.

16620199 is a deficient number, since it is larger than the sum of its proper divisors (12665).

16620199 is a wasteful number, since it uses less digits than its factorization.

16620199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12664.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 16620199 is about 4076.7878286710. The cubic root of 16620199 is about 255.1988657605.

The spelling of 16620199 in words is "sixteen million, six hundred twenty thousand, one hundred ninety-nine".