666345105 has 24 divisors (see below), whose sum is σ = 1215789120. Its totient is φ = 336679200.

The previous prime is 666345103. The next prime is 666345187. The reversal of 666345105 is 501543666.

It is not a de Polignac number, because 666345105 - 2¹ = 666345103 is a prime.

It is a super-2 number, since 2×666345105² = 888031597914922050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 666345105.

It is not an unprimeable number, because it can be changed into a prime (666345103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 388821 + ... + 390530.

It is an arithmetic number, because the mean of its divisors is an integer number (50657880).

Almost surely, 2^666345105 is an apocalyptic number.

It is an amenable number.

666345105 is a deficient number, since it is larger than the sum of its proper divisors (549444015).

666345105 is a wasteful number, since it uses less digits than its factorization.

666345105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779381 (or 779378 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 666345105 is about 25813.6612087476. The cubic root of 666345105 is about 873.4399871527.

The spelling of 666345105 in words is "six hundred sixty-six million, three hundred forty-five thousand, one hundred five".