2005656553 has 2 divisors, whose sum is σ = 2005656554. Its totient is φ = 2005656552.

The previous prime is 2005656551. The next prime is 2005656607. The reversal of 2005656553 is 3556565002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1321467904 + 684188649 = 36352^2 + 26157^2 .

It is a cyclic number.

It is not a de Polignac number, because 2005656553 - 2¹ = 2005656551 is a prime.

Together with 2005656551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2005656551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1002828276 + 1002828277.

It is an arithmetic number, because the mean of its divisors is an integer number (1002828277).

Almost surely, 2^2005656553 is an apocalyptic number.

It is an amenable number.

2005656553 is a deficient number, since it is larger than the sum of its proper divisors (1).

2005656553 is an equidigital number, since it uses as much as digits as its factorization.

2005656553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 135000, while the sum is 37.

The square root of 2005656553 is about 44784.5570816548. The cubic root of 2005656553 is about 1261.1077335396.

The spelling of 2005656553 in words is "two billion, five million, six hundred fifty-six thousand, five hundred fifty-three".