666400142 has 16 divisors (see below), whose sum is σ = 1026279072. Its totient is φ = 324343680.

The previous prime is 666400123. The next prime is 666400151. The reversal of 666400142 is 241004666.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 28583 + ... + 46365.

It is an arithmetic number, because the mean of its divisors is an integer number (64142442).

Almost surely, 2^666400142 is an apocalyptic number.

666400142 is a deficient number, since it is larger than the sum of its proper divisors (359878930).

666400142 is a wasteful number, since it uses less digits than its factorization.

666400142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18283.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 666400142 is about 25814.7272307882. The cubic root of 666400142 is about 873.4640338480.

The spelling of 666400142 in words is "six hundred sixty-six million, four hundred thousand, one hundred forty-two".