16776665 has 8 divisors (see below), whose sum is σ = 20600448. Its totient is φ = 13109040.

The previous prime is 16776659. The next prime is 16776679. The reversal of 16776665 is 56667761.

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

It is not a de Polignac number, because 16776665 - 2¹⁶ = 16711129 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38801 + ... + 39230.

It is an arithmetic number, because the mean of its divisors is an integer number (2575056).

Almost surely, 2^16776665 is an apocalyptic number.

It is an amenable number.

16776665 is a deficient number, since it is larger than the sum of its proper divisors (3823783).

16776665 is an equidigital number, since it uses as much as digits as its factorization.

16776665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78079.

The product of its digits is 317520, while the sum is 44.

The square root of 16776665 is about 4095.9327387056. The cubic root of 16776665 is about 255.9971974384.

The spelling of 16776665 in words is "sixteen million, seven hundred seventy-six thousand, six hundred sixty-five".