666326005 has 8 divisors (see below), whose sum is σ = 804887424. Its totient is φ = 529530000.

The previous prime is 666325943. The next prime is 666326009. The reversal of 666326005 is 500623666.

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

It is not a de Polignac number, because 666326005 - 2⁹ = 666325493 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 (666326009) 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, 440521 + ... + 442030.

It is an arithmetic number, because the mean of its divisors is an integer number (100610928).

Almost surely, 2^666326005 is an apocalyptic number.

It is an amenable number.

666326005 is a deficient number, since it is larger than the sum of its proper divisors (138561419).

666326005 is a wasteful number, since it uses less digits than its factorization.

666326005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882707.

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 666326005 is about 25813.2912469526. The cubic root of 666326005 is about 873.4316416957.

The spelling of 666326005 in words is "six hundred sixty-six million, three hundred twenty-six thousand, five".