666224604004 has 12 divisors (see below), whose sum is σ = 1170730789228. Its totient is φ = 331730092800.

The previous prime is 666224603999. The next prime is 666224604007. The reversal of 666224604004 is 400406422666.

It can be written as a sum of positive squares in 2 ways, for example, as 367420247104 + 298804356900 = 606152^2 + 546630^2 .

It is a super-2 number, since 2×666224604004² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (40) 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 (666224604007) 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 3 ways as a sum of consecutive naturals, for example, 345551217 + ... + 345553144.

Almost surely, 2^666224604004 is an apocalyptic number.

It is an amenable number.

666224604004 is a deficient number, since it is larger than the sum of its proper divisors (504506185224).

666224604004 is a wasteful number, since it uses less digits than its factorization.

666224604004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691104606 (or 691104604 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 40.

The spelling of 666224604004 in words is "six hundred sixty-six billion, two hundred twenty-four million, six hundred four thousand, four".