2573666 has 4 divisors (see below), whose sum is σ = 3860502. Its totient is φ = 1286832.

The previous prime is 2573657. The next prime is 2573689. The reversal of 2573666 is 6663752.

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

It can be written as a sum of positive squares in only one way, i.e., 2468041 + 105625 = 1571^2 + 325^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643415 + ... + 643418.

2^2573666 is an apocalyptic number.

2573666 is a deficient number, since it is larger than the sum of its proper divisors (1286836).

2573666 is a wasteful number, since it uses less digits than its factorization.

2573666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286835.

The product of its digits is 45360, while the sum is 35.

The square root of 2573666 is about 1604.2649407127. The cubic root of 2573666 is about 137.0410660630.

The spelling of 2573666 in words is "two million, five hundred seventy-three thousand, six hundred sixty-six".