2552621666 has 32 divisors (see below), whose sum is σ = 4455751680. Its totient is φ = 1074071376.

The previous prime is 2552621657. The next prime is 2552621681. The reversal of 2552621666 is 6661262552.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 896441 + ... + 899283.

It is an arithmetic number, because the mean of its divisors is an integer number (139242240).

Almost surely, 2^2552621666 is an apocalyptic number.

2552621666 is a deficient number, since it is larger than the sum of its proper divisors (1903130014).

2552621666 is a wasteful number, since it uses less digits than its factorization.

2552621666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3998.

The product of its digits is 259200, while the sum is 41.

The square root of 2552621666 is about 50523.4763847461. The cubic root of 2552621666 is about 1366.6652454344.

The spelling of 2552621666 in words is "two billion, five hundred fifty-two million, six hundred twenty-one thousand, six hundred sixty-six".