16666613 has 8 divisors (see below), whose sum is σ = 18124632. Its totient is φ = 15261696.

The previous prime is 16666609. The next prime is 16666621. The reversal of 16666613 is 31666661.

It can be written as a sum of positive squares in 4 ways, for example, as 11992369 + 4674244 = 3463^2 + 2162^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 16666613 - 2² = 16666609 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 (16660613) 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, 12620 + ... + 13877.

It is an arithmetic number, because the mean of its divisors is an integer number (2265579).

Almost surely, 2^16666613 is an apocalyptic number.

It is an amenable number.

16666613 is a deficient number, since it is larger than the sum of its proper divisors (1458019).

16666613 is a wasteful number, since it uses less digits than its factorization.

16666613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26551.

The product of its digits is 23328, while the sum is 35.

The square root of 16666613 is about 4082.4763318359. The cubic root of 16666613 is about 255.4362032957.

The spelling of 16666613 in words is "sixteen million, six hundred sixty-six thousand, six hundred thirteen".