666903401 has 8 divisors (see below), whose sum is σ = 726211200. Its totient is φ = 610016400.

The previous prime is 666903397. The next prime is 666903407. The reversal of 666903401 is 104309666.

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

It is a cyclic number.

It is not a de Polignac number, because 666903401 - 2² = 666903397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666903407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 604625 + ... + 605726.

It is an arithmetic number, because the mean of its divisors is an integer number (90776400).

Almost surely, 2^666903401 is an apocalyptic number.

It is an amenable number.

666903401 is a deficient number, since it is larger than the sum of its proper divisors (59307799).

666903401 is a wasteful number, since it uses less digits than its factorization.

666903401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210399.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 666903401 is about 25824.4729084642. The cubic root of 666903401 is about 873.6838557436.

The spelling of 666903401 in words is "six hundred sixty-six million, nine hundred three thousand, four hundred one".