1665665522 has 4 divisors (see below), whose sum is σ = 2498498286. Its totient is φ = 832832760.

The previous prime is 1665665509. The next prime is 1665665531. The reversal of 1665665522 is 2255665661.

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., 856206121 + 809459401 = 29261^2 + 28451^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 416416379 + ... + 416416382.

Almost surely, 2^1665665522 is an apocalyptic number.

1665665522 is a deficient number, since it is larger than the sum of its proper divisors (832832764).

1665665522 is an equidigital number, since it uses as much as digits as its factorization.

1665665522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832832763.

The product of its digits is 648000, while the sum is 44.

The square root of 1665665522 is about 40812.5657365474. The cubic root of 1665665522 is about 1185.3936562962.

The spelling of 1665665522 in words is "one billion, six hundred sixty-five million, six hundred sixty-five thousand, five hundred twenty-two".