2664561 has 8 divisors (see below), whose sum is σ = 3575200. Its totient is φ = 1765152.

The previous prime is 2664553. The next prime is 2664577. The reversal of 2664561 is 1654662.

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

It is not a de Polignac number, because 2664561 - 2³ = 2664553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2664511) 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, 2236 + ... + 3213.

It is an arithmetic number, because the mean of its divisors is an integer number (446900).

2^2664561 is an apocalyptic number.

It is an amenable number.

2664561 is a deficient number, since it is larger than the sum of its proper divisors (910639).

2664561 is a wasteful number, since it uses less digits than its factorization.

2664561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5615.

The product of its digits is 8640, while the sum is 30.

The square root of 2664561 is about 1632.3483084195. The cubic root of 2664561 is about 138.6357455658.

The spelling of 2664561 in words is "two million, six hundred sixty-four thousand, five hundred sixty-one".