2501666 has 8 divisors (see below), whose sum is σ = 3772524. Its totient is φ = 1244160.

The previous prime is 2501657. The next prime is 2501677. The reversal of 2501666 is 6661052.

It can be written as a sum of positive squares in 2 ways, for example, as 2449225 + 52441 = 1565^2 + 229^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2855 + ... + 3626.

2^2501666 is an apocalyptic number.

2501666 is a deficient number, since it is larger than the sum of its proper divisors (1270858).

2501666 is a wasteful number, since it uses less digits than its factorization.

2501666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6676.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2501666 is about 1581.6655778008. The cubic root of 2501666 is about 135.7510222670.

The spelling of 2501666 in words is "two million, five hundred one thousand, six hundred sixty-six".