2005660657 has 64 divisors (see below), whose sum is σ = 2786918400. Its totient is φ = 1393159680.

The previous prime is 2005660637. The next prime is 2005660693. The reversal of 2005660657 is 7560665002.

It is not a de Polignac number, because 2005660657 - 2⁷ = 2005660529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2005660627) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4186944 + ... + 4187422.

It is an arithmetic number, because the mean of its divisors is an integer number (43545600).

Almost surely, 2^2005660657 is an apocalyptic number.

It is an amenable number.

2005660657 is a deficient number, since it is larger than the sum of its proper divisors (781257743).

2005660657 is a wasteful number, since it uses less digits than its factorization.

2005660657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 2005660657 is about 44784.6029009971. The cubic root of 2005660657 is about 1261.1085937039.

The spelling of 2005660657 in words is "two billion, five million, six hundred sixty thousand, six hundred fifty-seven".