2002660666400 has 36 divisors (see below), whose sum is σ = 4888995353802. Its totient is φ = 801064266240.

The previous prime is 2002660666313. The next prime is 2002660666403. The reversal of 2002660666400 is 46660662002.

It can be written as a sum of positive squares in 3 ways, for example, as 776139856144 + 1226520810256 = 880988^2 + 1107484^2 .

It is not an unprimeable number, because it can be changed into a prime (2002660666403) 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 5 ways as a sum of consecutive naturals, for example, 1251662117 + ... + 1251663716.

Almost surely, 2^{2002660666400} is an apocalyptic number.

2002660666400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2002660666400 is an abundant number, since it is smaller than the sum of its proper divisors (2886334687402).

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

2002660666400 is a wasteful number, since it uses less digits than its factorization.

2002660666400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2503325853 (or 2503325840 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 38.

The spelling of 2002660666400 in words is "two trillion, two billion, six hundred sixty million, six hundred sixty-six thousand, four hundred".