666203946 has 8 divisors (see below), whose sum is σ = 1332407904. Its totient is φ = 222067980.

The previous prime is 666203927. The next prime is 666203959. The reversal of 666203946 is 649302666.

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

666203946 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 666203898 and 666203907.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55516990 + ... + 55517001.

It is an arithmetic number, because the mean of its divisors is an integer number (166550988).

Almost surely, 2^666203946 is an apocalyptic number.

666203946 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.

666203946 is a wasteful number, since it uses less digits than its factorization.

666203946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111033996.

The product of its (nonzero) digits is 279936, while the sum is 42.

The square root of 666203946 is about 25810.9268721602. The cubic root of 666203946 is about 873.3783060901.

The spelling of 666203946 in words is "six hundred sixty-six million, two hundred three thousand, nine hundred forty-six".