666195942 has 8 divisors (see below), whose sum is σ = 1332391896. Its totient is φ = 222065312.

The previous prime is 666195923. The next prime is 666195953. The reversal of 666195942 is 249591666.

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

666195942 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 666195891 and 666195900.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55516323 + ... + 55516334.

It is an arithmetic number, because the mean of its divisors is an integer number (166548987).

Almost surely, 2^666195942 is an apocalyptic number.

666195942 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

666195942 is a wasteful number, since it uses less digits than its factorization.

666195942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111032662.

The product of its digits is 699840, while the sum is 48.

The square root of 666195942 is about 25810.7718210828. The cubic root of 666195942 is about 873.3748083884.

The spelling of 666195942 in words is "six hundred sixty-six million, one hundred ninety-five thousand, nine hundred forty-two".