2155666665512 has 64 divisors (see below), whose sum is σ = 4160622024000. Its totient is φ = 1046716070400.

The previous prime is 2155666665419. The next prime is 2155666665527.

2155666665512 is nontrivially palindromic in base 10.

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, 12528239 + ... + 12699137.

It is an arithmetic number, because the mean of its divisors is an integer number (65009719125).

Almost surely, 2^{2155666665512} is an apocalyptic number.

It is an amenable number.

2155666665512 is a deficient number, since it is larger than the sum of its proper divisors (2004955358488).

2155666665512 is a wasteful number, since it uses less digits than its factorization.

2155666665512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171306 (or 171302 counting only the distinct ones).

The product of its digits is 19440000, while the sum is 56.

The spelling of 2155666665512 in words is "two trillion, one hundred fifty-five billion, six hundred sixty-six million, six hundred sixty-five thousand, five hundred twelve".