666202401 has 20 divisors (see below), whose sum is σ = 996072000. Its totient is φ = 443741976.

The previous prime is 666202391. The next prime is 666202417. The reversal of 666202401 is 104202666.

It is a happy number.

666202401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666202401 - 2²² = 662008097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (666204401) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 110380 + ... + 116258.

It is an arithmetic number, because the mean of its divisors is an integer number (49803600).

Almost surely, 2^666202401 is an apocalyptic number.

It is an amenable number.

666202401 is a deficient number, since it is larger than the sum of its proper divisors (329869599).

666202401 is a wasteful number, since it uses less digits than its factorization.

666202401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7290 (or 7281 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 666202401 is about 25810.8969429580. The cubic root of 666202401 is about 873.3776309362.

The spelling of 666202401 in words is "six hundred sixty-six million, two hundred two thousand, four hundred one".