2005005551 has 4 divisors (see below), whose sum is σ = 2122947072. Its totient is φ = 1887064032.

The previous prime is 2005005547. The next prime is 2005005553. The reversal of 2005005551 is 1555005002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1555005002 = 2 ⋅777502501.

It is a cyclic number.

It is not a de Polignac number, because 2005005551 - 2² = 2005005547 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 (2005005553) 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, 58970735 + ... + 58970768.

It is an arithmetic number, because the mean of its divisors is an integer number (530736768).

Almost surely, 2^2005005551 is an apocalyptic number.

2005005551 is a deficient number, since it is larger than the sum of its proper divisors (117941521).

2005005551 is a wasteful number, since it uses less digits than its factorization.

2005005551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117941520.

The product of its (nonzero) digits is 1250, while the sum is 23.

The square root of 2005005551 is about 44777.2883390676. The cubic root of 2005005551 is about 1260.9712740683.

The spelling of 2005005551 in words is "two billion, five million, five thousand, five hundred fifty-one".