666379836 has 18 divisors (see below), whose sum is σ = 1684460232. Its totient is φ = 222126600.

The previous prime is 666379823. The next prime is 666379853. The reversal of 666379836 is 638973666.

It is a happy number.

666379836 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9255240 + ... + 9255311.

It is an arithmetic number, because the mean of its divisors is an integer number (93581124).

Almost surely, 2^666379836 is an apocalyptic number.

It is an amenable number.

666379836 is an abundant number, since it is smaller than the sum of its proper divisors (1018080396).

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

666379836 is a wasteful number, since it uses less digits than its factorization.

666379836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18510561 (or 18510556 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 54.

The square root of 666379836 is about 25814.3339251665. Note that the first 3 decimals coincide. The cubic root of 666379836 is about 873.4551619307.

The spelling of 666379836 in words is "six hundred sixty-six million, three hundred seventy-nine thousand, eight hundred thirty-six".