665501090 has 16 divisors (see below), whose sum is σ = 1249985088. Its totient is φ = 254626416.

The previous prime is 665501047. The next prime is 665501093. The reversal of 665501090 is 90105566.

It is not an unprimeable number, because it can be changed into a prime (665501093) 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, 1446512 + ... + 1446971.

It is an arithmetic number, because the mean of its divisors is an integer number (78124068).

Almost surely, 2^665501090 is an apocalyptic number.

665501090 is a deficient number, since it is larger than the sum of its proper divisors (584483998).

665501090 is a wasteful number, since it uses less digits than its factorization.

665501090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2893513.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 665501090 is about 25797.3078052730. The cubic root of 665501090 is about 873.0710552399.

The spelling of 665501090 in words is "six hundred sixty-five million, five hundred one thousand, ninety".