1664165242 has 8 divisors (see below), whose sum is σ = 2496861396. Its totient is φ = 831878112.

The previous prime is 1664165227. The next prime is 1664165263. The reversal of 1664165242 is 2425614661.

It can be written as a sum of positive squares in 2 ways, for example, as 936298801 + 727866441 = 30599^2 + 26979^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91873 + ... + 108484.

Almost surely, 2^1664165242 is an apocalyptic number.

1664165242 is a deficient number, since it is larger than the sum of its proper divisors (832696154).

1664165242 is a wasteful number, since it uses less digits than its factorization.

1664165242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204512.

The product of its digits is 69120, while the sum is 37.

The square root of 1664165242 is about 40794.1814723620. The cubic root of 1664165242 is about 1185.0376511267.

The spelling of 1664165242 in words is "one billion, six hundred sixty-four million, one hundred sixty-five thousand, two hundred forty-two".