664166404 has 24 divisors (see below), whose sum is σ = 1342541088. Its totient is φ = 284135040.

The previous prime is 664166389. The next prime is 664166407. The reversal of 664166404 is 404661466.

It is a happy number.

It is a super-2 number, since 2×664166404² = 882234024404582432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664166407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 443214 + ... + 444709.

It is an arithmetic number, because the mean of its divisors is an integer number (55939212).

Almost surely, 2^664166404 is an apocalyptic number.

It is an amenable number.

664166404 is an abundant number, since it is smaller than the sum of its proper divisors (678374684).

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

664166404 is a wasteful number, since it uses less digits than its factorization.

664166404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887955 (or 887953 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 664166404 is about 25771.4261149825. The cubic root of 664166404 is about 872.4870063171.

The spelling of 664166404 in words is "six hundred sixty-four million, one hundred sixty-six thousand, four hundred four".