2663691 has 8 divisors (see below), whose sum is σ = 3578064. Its totient is φ = 1762560.

The previous prime is 2663677. The next prime is 2663693. The reversal of 2663691 is 1963662.

It is a happy number.

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

It is not a de Polignac number, because 2663691 - 2⁶ = 2663627 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2663693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2830 + ... + 3651.

It is an arithmetic number, because the mean of its divisors is an integer number (447258).

2^2663691 is an apocalyptic number.

2663691 is a deficient number, since it is larger than the sum of its proper divisors (914373).

2663691 is a wasteful number, since it uses less digits than its factorization.

2663691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6621.

The product of its digits is 11664, while the sum is 33.

The square root of 2663691 is about 1632.0817994206. The cubic root of 2663691 is about 138.6206553717.

The spelling of 2663691 in words is "two million, six hundred sixty-three thousand, six hundred ninety-one".