2166111211515 has 16 divisors (see below), whose sum is σ = 3485811341088. Its totient is φ = 1148581511936.

The previous prime is 2166111211493. The next prime is 2166111211531. The reversal of 2166111211515 is 5151121116612.

It is a cyclic number.

It is not a de Polignac number, because 2166111211515 - 2⁷ = 2166111211387 is a prime.

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, 417359874 + ... + 417365063.

It is an arithmetic number, because the mean of its divisors is an integer number (217863208818).

Almost surely, 2^{2166111211515} is an apocalyptic number.

2166111211515 is a deficient number, since it is larger than the sum of its proper divisors (1319700129573).

2166111211515 is a wasteful number, since it uses less digits than its factorization.

2166111211515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834725118.

The product of its digits is 3600, while the sum is 33.

The spelling of 2166111211515 in words is "two trillion, one hundred sixty-six billion, one hundred eleven million, two hundred eleven thousand, five hundred fifteen".