666327723666 has 32 divisors (see below), whose sum is σ = 1477638835776. Its totient is φ = 198607368000.

The previous prime is 666327723661. The next prime is 666327723671.

666327723666 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (666327723661) and next prime (666327723671).

It is not an unprimeable number, because it can be changed into a prime (666327723661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82749045 + ... + 82757096.

It is an arithmetic number, because the mean of its divisors is an integer number (46176213618).

Almost surely, 2^666327723666 is an apocalyptic number.

666327723666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

666327723666 is an abundant number, since it is smaller than the sum of its proper divisors (811311112110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666327723666 is a wasteful number, since it uses less digits than its factorization.

666327723666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165506218.

The product of its digits is 82301184, while the sum is 60.

The spelling of 666327723666 in words is "six hundred sixty-six billion, three hundred twenty-seven million, seven hundred twenty-three thousand, six hundred sixty-six".