1665110066 has 4 divisors (see below), whose sum is σ = 2497665102. Its totient is φ = 832555032.

The previous prime is 1665110059. The next prime is 1665110137. The reversal of 1665110066 is 6600115661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1155660025 + 509450041 = 33995^2 + 22571^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 416277515 + ... + 416277518.

Almost surely, 2^1665110066 is an apocalyptic number.

1665110066 is a deficient number, since it is larger than the sum of its proper divisors (832555036).

1665110066 is an equidigital number, since it uses as much as digits as its factorization.

1665110066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832555035.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1665110066 is about 40805.7602061278. The cubic root of 1665110066 is about 1185.2618756928.

The spelling of 1665110066 in words is "one billion, six hundred sixty-five million, one hundred ten thousand, sixty-six".