666195078 has 16 divisors (see below), whose sum is σ = 1354973760. Its totient is φ = 218301096.

The previous prime is 666195077. The next prime is 666195191. The reversal of 666195078 is 870591666.

666195078 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666195073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 940600 + ... + 941307.

It is an arithmetic number, because the mean of its divisors is an integer number (84685860).

Almost surely, 2^666195078 is an apocalyptic number.

666195078 is an abundant number, since it is smaller than the sum of its proper divisors (688778682).

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

666195078 is a wasteful number, since it uses less digits than its factorization.

666195078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881971.

The product of its (nonzero) digits is 544320, while the sum is 48.

The square root of 666195078 is about 25810.7550838793. The cubic root of 666195078 is about 873.3744308237.

The spelling of 666195078 in words is "six hundred sixty-six million, one hundred ninety-five thousand, seventy-eight".