2161242106666 has 16 divisors (see below), whose sum is σ = 3247707310848. Its totient is φ = 1078673198400.

The previous prime is 2161242106631. The next prime is 2161242106739. The reversal of 2161242106666 is 6666012421612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30790951 + ... + 30861061.

It is an arithmetic number, because the mean of its divisors is an integer number (202981706928).

Almost surely, 2^{2161242106666} is an apocalyptic number.

2161242106666 is a deficient number, since it is larger than the sum of its proper divisors (1086465204182).

2161242106666 is a wasteful number, since it uses less digits than its factorization.

2161242106666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97677.

The product of its (nonzero) digits is 248832, while the sum is 43.

The spelling of 2161242106666 in words is "two trillion, one hundred sixty-one billion, two hundred forty-two million, one hundred six thousand, six hundred sixty-six".