2505604666 has 4 divisors (see below), whose sum is σ = 3758407002. Its totient is φ = 1252802332.

The previous prime is 2505604663. The next prime is 2505604681. The reversal of 2505604666 is 6664065052.

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., 2381928025 + 123676641 = 48805^2 + 11121^2 .

It is not an unprimeable number, because it can be changed into a prime (2505604663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626401165 + ... + 626401168.

Almost surely, 2^2505604666 is an apocalyptic number.

2505604666 is a deficient number, since it is larger than the sum of its proper divisors (1252802336).

2505604666 is a wasteful number, since it uses less digits than its factorization.

2505604666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252802335.

The product of its (nonzero) digits is 259200, while the sum is 40.

The square root of 2505604666 is about 50056.0152828808. The cubic root of 2505604666 is about 1358.2222782613. Note that the first 4 decimals are identical.

The spelling of 2505604666 in words is "two billion, five hundred five million, six hundred four thousand, six hundred sixty-six".