666006204440 has 32 divisors (see below), whose sum is σ = 1498895712000. Its totient is φ = 266334614784.

The previous prime is 666006204433. The next prime is 666006204443. The reversal of 666006204440 is 44402600666.

It is a junction number, because it is equal to n+sod(n) for n = 666006204394 and 666006204403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666006204443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1961720 + ... + 2276039.

It is an arithmetic number, because the mean of its divisors is an integer number (46840491000).

Almost surely, 2^666006204440 is an apocalyptic number.

It is an amenable number.

666006204440 is an abundant number, since it is smaller than the sum of its proper divisors (832889507560).

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

666006204440 is a wasteful number, since it uses less digits than its factorization.

666006204440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4241699 (or 4241695 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 38.

The spelling of 666006204440 in words is "six hundred sixty-six billion, six million, two hundred four thousand, four hundred forty".