2661679 has 4 divisors (see below), whose sum is σ = 2726640. Its totient is φ = 2596720.

The previous prime is 2661661. The next prime is 2661689. The reversal of 2661679 is 9761662.

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

It is a cyclic number.

It is not a de Polignac number, because 2661679 - 2⁵ = 2661647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32419 + ... + 32500.

It is an arithmetic number, because the mean of its divisors is an integer number (681660).

2^2661679 is an apocalyptic number.

2661679 is a deficient number, since it is larger than the sum of its proper divisors (64961).

2661679 is an equidigital number, since it uses as much as digits as its factorization.

2661679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64960.

The product of its digits is 27216, while the sum is 37.

The square root of 2661679 is about 1631.4652923063. The cubic root of 2661679 is about 138.5857445392.

The spelling of 2661679 in words is "two million, six hundred sixty-one thousand, six hundred seventy-nine".