1665872349 has 8 divisors (see below), whose sum is σ = 2281194720. Its totient is φ = 1080565776.

The previous prime is 1665872339. The next prime is 1665872399. The reversal of 1665872349 is 9432785661.

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

It is not a de Polignac number, because 1665872349 - 2⁸ = 1665872093 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665872339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7503819 + ... + 7504040.

It is an arithmetic number, because the mean of its divisors is an integer number (285149340).

Almost surely, 2^1665872349 is an apocalyptic number.

It is an amenable number.

1665872349 is a deficient number, since it is larger than the sum of its proper divisors (615322371).

1665872349 is a wasteful number, since it uses less digits than its factorization.

1665872349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15007899.

The product of its digits is 2177280, while the sum is 51.

The square root of 1665872349 is about 40815.0995221131. The cubic root of 1665872349 is about 1185.4427180202.

The spelling of 1665872349 in words is "one billion, six hundred sixty-five million, eight hundred seventy-two thousand, three hundred forty-nine".