16660766 has 4 divisors (see below), whose sum is σ = 24991152. Its totient is φ = 8330382.

The previous prime is 16660753. The next prime is 16660769. The reversal of 16660766 is 66706661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66706661 = 7 ⋅9529523.

It is a super-2 number, since 2×16660766² = 555162247413512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16660769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4165190 + ... + 4165193.

It is an arithmetic number, because the mean of its divisors is an integer number (6247788).

Almost surely, 2^16660766 is an apocalyptic number.

16660766 is a deficient number, since it is larger than the sum of its proper divisors (8330386).

16660766 is an equidigital number, since it uses as much as digits as its factorization.

16660766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8330385.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 16660766 is about 4081.7601595390. The cubic root of 16660766 is about 255.4063289962.

The spelling of 16660766 in words is "sixteen million, six hundred sixty thousand, seven hundred sixty-six".