665331490 has 16 divisors (see below), whose sum is σ = 1214003448. Its totient is φ = 262486656.

The previous prime is 665331481. The next prime is 665331503. The reversal of 665331490 is 94133566.

It can be written as a sum of positive squares in 4 ways, for example, as 335146249 + 330185241 = 18307^2 + 18171^2 .

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 in 7 ways as a sum of consecutive naturals, for example, 454977 + ... + 456436.

Almost surely, 2^665331490 is an apocalyptic number.

665331490 is a deficient number, since it is larger than the sum of its proper divisors (548671958).

665331490 is a wasteful number, since it uses less digits than its factorization.

665331490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911493.

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 665331490 is about 25794.0204310999. The cubic root of 665331490 is about 872.9968828438.

The spelling of 665331490 in words is "six hundred sixty-five million, three hundred thirty-one thousand, four hundred ninety".