2661646 has 16 divisors (see below), whose sum is σ = 4332384. Its totient is φ = 1219104.

The previous prime is 2661643. The next prime is 2661647. The reversal of 2661646 is 6461662.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661641) 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, 4036 + ... + 4648.

It is an arithmetic number, because the mean of its divisors is an integer number (270774).

2^2661646 is an apocalyptic number.

2661646 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2661646 is a deficient number, since it is larger than the sum of its proper divisors (1670738).

2661646 is a wasteful number, since it uses less digits than its factorization.

2661646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795.

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

The square root of 2661646 is about 1631.4551786672. The cubic root of 2661646 is about 138.5851717994.

It can be divided in two parts, 26616 and 46, that added together give a palindrome (26662).

The spelling of 2661646 in words is "two million, six hundred sixty-one thousand, six hundred forty-six".