2005656557 has 8 divisors (see below), whose sum is σ = 2093308800. Its totient is φ = 1918041840.

The previous prime is 2005656553. The next prime is 2005656607. The reversal of 2005656557 is 7556565002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2005656557 - 2² = 2005656553 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 (2005656551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192707 + ... + 202847.

It is an arithmetic number, because the mean of its divisors is an integer number (261663600).

Almost surely, 2^2005656557 is an apocalyptic number.

It is an amenable number.

2005656557 is a deficient number, since it is larger than the sum of its proper divisors (87652243).

2005656557 is a wasteful number, since it uses less digits than its factorization.

2005656557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18763.

The product of its (nonzero) digits is 315000, while the sum is 41.

The square root of 2005656557 is about 44784.5571263131. The cubic root of 2005656557 is about 1261.1077343780.

The spelling of 2005656557 in words is "two billion, five million, six hundred fifty-six thousand, five hundred fifty-seven".