666556005 has 32 divisors (see below), whose sum is σ = 1124144640. Its totient is φ = 336329280.

The previous prime is 666556003. The next prime is 666556049. The reversal of 666556005 is 500655666.

It is a happy number.

It is not a de Polignac number, because 666556005 - 2¹ = 666556003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666556003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 330450 + ... + 332460.

It is an arithmetic number, because the mean of its divisors is an integer number (35129520).

Almost surely, 2^666556005 is an apocalyptic number.

It is an amenable number.

666556005 is a deficient number, since it is larger than the sum of its proper divisors (457588635).

666556005 is a wasteful number, since it uses less digits than its factorization.

666556005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3201.

The product of its (nonzero) digits is 162000, while the sum is 39.

The square root of 666556005 is about 25817.7459318198. The cubic root of 666556005 is about 873.5321261265.

The spelling of 666556005 in words is "six hundred sixty-six million, five hundred fifty-six thousand, five".