2552561566 has 4 divisors (see below), whose sum is σ = 3828842352. Its totient is φ = 1276280782.

The previous prime is 2552561519. The next prime is 2552561573. The reversal of 2552561566 is 6651652552.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638140390 + ... + 638140393.

It is an arithmetic number, because the mean of its divisors is an integer number (957210588).

Almost surely, 2^2552561566 is an apocalyptic number.

2552561566 is a deficient number, since it is larger than the sum of its proper divisors (1276280786).

2552561566 is a wasteful number, since it uses less digits than its factorization.

2552561566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276280785.

The product of its digits is 540000, while the sum is 43.

The square root of 2552561566 is about 50522.8816082377. The cubic root of 2552561566 is about 1366.6545195695.

The spelling of 2552561566 in words is "two billion, five hundred fifty-two million, five hundred sixty-one thousand, five hundred sixty-six".