666400105 has 16 divisors (see below), whose sum is σ = 915431040. Its totient is φ = 456204672.

The previous prime is 666400099. The next prime is 666400109. The reversal of 666400105 is 501004666.

It is not a de Polignac number, because 666400105 - 2⁵ = 666400073 is a prime.

It is a super-3 number, since 3×666400105³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (666400109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6166 + ... + 37024.

It is an arithmetic number, because the mean of its divisors is an integer number (57214440).

Almost surely, 2^666400105 is an apocalyptic number.

It is an amenable number.

666400105 is a deficient number, since it is larger than the sum of its proper divisors (249030935).

666400105 is a wasteful number, since it uses less digits than its factorization.

666400105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31488.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 666400105 is about 25814.7265141430. The cubic root of 666400105 is about 873.4640176824.

The spelling of 666400105 in words is "six hundred sixty-six million, four hundred thousand, one hundred five".