16660407 has 4 divisors (see below), whose sum is σ = 22213880. Its totient is φ = 11106936.

The previous prime is 16660403. The next prime is 16660417. The reversal of 16660407 is 70406661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 16660407 - 2² = 16660403 is a prime.

It is a super-2 number, since 2×16660407² = 555138322811298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16660403) 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, 2776732 + ... + 2776737.

It is an arithmetic number, because the mean of its divisors is an integer number (5553470).

Almost surely, 2^16660407 is an apocalyptic number.

16660407 is a deficient number, since it is larger than the sum of its proper divisors (5553473).

16660407 is an equidigital number, since it uses as much as digits as its factorization.

16660407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5553472.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 16660407 is about 4081.7161831759. The cubic root of 16660407 is about 255.4044945161.

The spelling of 16660407 in words is "sixteen million, six hundred sixty thousand, four hundred seven".