16664771 has 4 divisors (see below), whose sum is σ = 16672944. Its totient is φ = 16656600.

The previous prime is 16664761. The next prime is 16664783. The reversal of 16664771 is 17746661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 17746661 = 1499 ⋅11839.

It is a cyclic number.

It is not a de Polignac number, because 16664771 - 2²² = 12470467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16664731) 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 in 3 ways as a sum of consecutive naturals, for example, 1781 + ... + 6041.

It is an arithmetic number, because the mean of its divisors is an integer number (4168236).

Almost surely, 2^16664771 is an apocalyptic number.

16664771 is a deficient number, since it is larger than the sum of its proper divisors (8173).

16664771 is an equidigital number, since it uses as much as digits as its factorization.

16664771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8172.

The product of its digits is 42336, while the sum is 38.

The square root of 16664771 is about 4082.2507272337. The cubic root of 16664771 is about 255.4267926490.

The spelling of 16664771 in words is "sixteen million, six hundred sixty-four thousand, seven hundred seventy-one".