1666105115 has 12 divisors (see below), whose sum is σ = 2042783616. Its totient is φ = 1304516208.

The previous prime is 1666105081. The next prime is 1666105121. The reversal of 1666105115 is 5115016661.

It is not a de Polignac number, because 1666105115 - 2¹⁴ = 1666088731 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64379 + ... + 86468.

It is an arithmetic number, because the mean of its divisors is an integer number (170231968).

Almost surely, 2^1666105115 is an apocalyptic number.

1666105115 is a deficient number, since it is larger than the sum of its proper divisors (376678501).

1666105115 is an equidigital number, since it uses as much as digits as its factorization.

1666105115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150946 (or 150899 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 1666105115 is about 40817.9508917339. The cubic root of 1666105115 is about 1185.4979279146.

The spelling of 1666105115 in words is "one billion, six hundred sixty-six million, one hundred five thousand, one hundred fifteen".