2646661 has 4 divisors (see below), whose sum is σ = 2696652. Its totient is φ = 2596672.

The previous prime is 2646659. The next prime is 2646671. The reversal of 2646661 is 1666462.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1221025 + 1425636 = 1105^2 + 1194^2 .

It is a cyclic number.

It is not a de Polignac number, because 2646661 - 2¹ = 2646659 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2646641) 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, 24916 + ... + 25021.

It is an arithmetic number, because the mean of its divisors is an integer number (674163).

2^2646661 is an apocalyptic number.

It is an amenable number.

2646661 is a deficient number, since it is larger than the sum of its proper divisors (49991).

2646661 is an equidigital number, since it uses as much as digits as its factorization.

2646661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49990.

The product of its digits is 10368, while the sum is 31.

The square root of 2646661 is about 1626.8561706555. The cubic root of 2646661 is about 138.3246051815.

The spelling of 2646661 in words is "two million, six hundred forty-six thousand, six hundred sixty-one".