666903402 has 64 divisors (see below), whose sum is σ = 1621872000. Its totient is φ = 201450240.

The previous prime is 666903397. The next prime is 666903407. The reversal of 666903402 is 204309666.

It is an interprime number because it is at equal distance from previous prime (666903397) and next prime (666903407).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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 31 ways as a sum of consecutive naturals, for example, 205698 + ... + 208914.

It is an arithmetic number, because the mean of its divisors is an integer number (25341750).

Almost surely, 2^666903402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666903402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (810936000).

666903402 is an abundant number, since it is smaller than the sum of its proper divisors (954968598).

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

666903402 is a wasteful number, since it uses less digits than its factorization.

666903402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3588 (or 3582 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 666903402 is about 25824.4729278257. The cubic root of 666903402 is about 873.6838561803.

The spelling of 666903402 in words is "six hundred sixty-six million, nine hundred three thousand, four hundred two".