2001111999966 has 32 divisors (see below), whose sum is σ = 4496880909600. Its totient is φ = 659542530240.

The previous prime is 2001111999941. The next prime is 2001111999973. The reversal of 2001111999966 is 6699991111002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 208184125 + ... + 208193736.

It is an arithmetic number, because the mean of its divisors is an integer number (140527528425).

Almost surely, 2^{2001111999966} is an apocalyptic number.

2001111999966 is an abundant number, since it is smaller than the sum of its proper divisors (2495768909634).

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

2001111999966 is a wasteful number, since it uses less digits than its factorization.

2001111999966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416377961 (or 416377955 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 54.

The spelling of 2001111999966 in words is "two trillion, one billion, one hundred eleven million, nine hundred ninety-nine thousand, nine hundred sixty-six".