2005566551 has 4 divisors (see below), whose sum is σ = 2123541072. Its totient is φ = 1887592032.

The previous prime is 2005566547. The next prime is 2005566557. The reversal of 2005566551 is 1556655002.

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

It is a cyclic number.

It is not a de Polignac number, because 2005566551 - 2² = 2005566547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005566557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58987235 + ... + 58987268.

It is an arithmetic number, because the mean of its divisors is an integer number (530885268).

Almost surely, 2^2005566551 is an apocalyptic number.

2005566551 is a deficient number, since it is larger than the sum of its proper divisors (117974521).

2005566551 is a wasteful number, since it uses less digits than its factorization.

2005566551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117974520.

The product of its (nonzero) digits is 45000, while the sum is 35.

The square root of 2005566551 is about 44783.5522374007. The cubic root of 2005566551 is about 1261.0888695728.

The spelling of 2005566551 in words is "two billion, five million, five hundred sixty-six thousand, five hundred fifty-one".