666266604 has 24 divisors (see below), whose sum is σ = 1583956080. Its totient is φ = 217898304.

The previous prime is 666266593. The next prime is 666266609. The reversal of 666266604 is 406662666.

It is a happy number.

It is a super-2 number, since 2×666266604² = 887822375211385632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666266609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 523159 + ... + 524430.

It is an arithmetic number, because the mean of its divisors is an integer number (65998170).

Almost surely, 2^666266604 is an apocalyptic number.

It is an amenable number.

666266604 is an abundant number, since it is smaller than the sum of its proper divisors (917689476).

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

666266604 is a wasteful number, since it uses less digits than its factorization.

666266604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047649 (or 1047647 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 42.

The square root of 666266604 is about 25812.1406318810. The cubic root of 666266604 is about 873.4056863053.

The spelling of 666266604 in words is "six hundred sixty-six million, two hundred sixty-six thousand, six hundred four".