2113650405666 has 16 divisors (see below), whose sum is σ = 4697000901600. Its totient is φ = 704550135204.

The previous prime is 2113650405661. The next prime is 2113650405697. The reversal of 2113650405666 is 6665040563112.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2113650405661) 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, 19570837036 + ... + 19570837143.

It is an arithmetic number, because the mean of its divisors is an integer number (293562556350).

Almost surely, 2^{2113650405666} is an apocalyptic number.

2113650405666 is an abundant number, since it is smaller than the sum of its proper divisors (2583350495934).

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

2113650405666 is a wasteful number, since it uses less digits than its factorization.

2113650405666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39141674190 (or 39141674184 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

Adding to 2113650405666 its reverse (6665040563112), we get a palindrome (8778690968778).

The spelling of 2113650405666 in words is "two trillion, one hundred thirteen billion, six hundred fifty million, four hundred five thousand, six hundred sixty-six".