1665049975 has 24 divisors (see below), whose sum is σ = 2120489280. Its totient is φ = 1296192000.

The previous prime is 1665049963. The next prime is 1665049979. The reversal of 1665049975 is 5799405661.

It is not a de Polignac number, because 1665049975 - 2⁷ = 1665049847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665049979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 439891 + ... + 443659.

It is an arithmetic number, because the mean of its divisors is an integer number (88353720).

Almost surely, 2^1665049975 is an apocalyptic number.

1665049975 is a deficient number, since it is larger than the sum of its proper divisors (455439305).

1665049975 is a wasteful number, since it uses less digits than its factorization.

1665049975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4251 (or 4246 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 52.

The square root of 1665049975 is about 40805.0238941236. The cubic root of 1665049975 is about 1185.2476174906.

The spelling of 1665049975 in words is "one billion, six hundred sixty-five million, forty-nine thousand, nine hundred seventy-five".