2564666 has 8 divisors (see below), whose sum is σ = 4142964. Its totient is φ = 1183680.

The previous prime is 2564663. The next prime is 2564669. The reversal of 2564666 is 6664652.

It is an interprime number because it is at equal distance from previous prime (2564663) and next prime (2564669).

It can be written as a sum of positive squares in 2 ways, for example, as 2512225 + 52441 = 1585^2 + 229^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2564663) 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, 49295 + ... + 49346.

2^2564666 is an apocalyptic number.

2564666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2564666 is a deficient number, since it is larger than the sum of its proper divisors (1578298).

2564666 is a wasteful number, since it uses less digits than its factorization.

2564666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98656.

The product of its digits is 51840, while the sum is 35.

The square root of 2564666 is about 1601.4574611897. The cubic root of 2564666 is about 136.8811372463.

The spelling of 2564666 in words is "two million, five hundred sixty-four thousand, six hundred sixty-six".