666704040040 has 16 divisors (see below), whose sum is σ = 1500084090180. Its totient is φ = 266681616000.

The previous prime is 666704040017. The next prime is 666704040043. The reversal of 666704040040 is 40040407666.

It can be written as a sum of positive squares in 2 ways, for example, as 648665938404 + 18038101636 = 805398^2 + 134306^2 .

It is not an unprimeable number, because it can be changed into a prime (666704040043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8333800461 + ... + 8333800540.

Almost surely, 2^666704040040 is an apocalyptic number.

It is an amenable number.

666704040040 is an abundant number, since it is smaller than the sum of its proper divisors (833380050140).

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

666704040040 is a wasteful number, since it uses less digits than its factorization.

666704040040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16667601012 (or 16667601008 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 37.

The spelling of 666704040040 in words is "six hundred sixty-six billion, seven hundred four million, forty thousand, forty".