1666610065 has 24 divisors (see below), whose sum is σ = 2090333952. Its totient is φ = 1274187840.

The previous prime is 1666610041. The next prime is 1666610081. The reversal of 1666610065 is 5600166661.

It is not a de Polignac number, because 1666610065 - 2¹¹ = 1666608017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5257287 + ... + 5257603.

It is an arithmetic number, because the mean of its divisors is an integer number (87097248).

Almost surely, 2^1666610065 is an apocalyptic number.

It is an amenable number.

1666610065 is a deficient number, since it is larger than the sum of its proper divisors (423723887).

1666610065 is an equidigital number, since it uses as much as digits as its factorization.

1666610065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 1666610065 is about 40824.1358144909. The cubic root of 1666610065 is about 1185.6176796055.

The spelling of 1666610065 in words is "one billion, six hundred sixty-six million, six hundred ten thousand, sixty-five".