665850380 has 48 divisors (see below), whose sum is σ = 1530568704. Its totient is φ = 241816320.

The previous prime is 665850377. The next prime is 665850413. The reversal of 665850380 is 83058566.

It is a super-2 number, since 2×665850380² = 886713457092288800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5132 + ... + 36851.

It is an arithmetic number, because the mean of its divisors is an integer number (31886848).

Almost surely, 2^665850380 is an apocalyptic number.

It is an amenable number.

665850380 is an abundant number, since it is smaller than the sum of its proper divisors (864718324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665850380 is a wasteful number, since it uses less digits than its factorization.

665850380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42066 (or 42064 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 665850380 is about 25804.0768096826. The cubic root of 665850380 is about 873.2237730725.

The spelling of 665850380 in words is "six hundred sixty-five million, eight hundred fifty thousand, three hundred eighty".