665180390 has 48 divisors (see below), whose sum is σ = 1398052224. Its totient is φ = 227203200.

The previous prime is 665180387. The next prime is 665180419. The reversal of 665180390 is 93081566.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 135275 + ... + 140105.

It is an arithmetic number, because the mean of its divisors is an integer number (29126088).

Almost surely, 2^665180390 is an apocalyptic number.

665180390 is an abundant number, since it is smaller than the sum of its proper divisors (732871834).

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

665180390 is a wasteful number, since it uses less digits than its factorization.

665180390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5133 (or 5126 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 665180390 is about 25791.0912913742. The cubic root of 665180390 is about 872.9307905685.

The spelling of 665180390 in words is "six hundred sixty-five million, one hundred eighty thousand, three hundred ninety".