16665674 has 4 divisors (see below), whose sum is σ = 24998514. Its totient is φ = 8332836.

The previous prime is 16665673. The next prime is 16665697. The reversal of 16665674 is 47656661.

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

It can be written as a sum of positive squares in only one way, i.e., 12285025 + 4380649 = 3505^2 + 2093^2 .

It is not an unprimeable number, because it can be changed into a prime (16665673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4166417 + ... + 4166420.

Almost surely, 2^16665674 is an apocalyptic number.

16665674 is a deficient number, since it is larger than the sum of its proper divisors (8332840).

16665674 is an equidigital number, since it uses as much as digits as its factorization.

16665674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8332839.

The product of its digits is 181440, while the sum is 41.

The square root of 16665674 is about 4082.3613264874. The cubic root of 16665674 is about 255.4314060983.

The spelling of 16665674 in words is "sixteen million, six hundred sixty-five thousand, six hundred seventy-four".