665616450 has 24 divisors (see below), whose sum is σ = 1650729168. Its totient is φ = 177497680.

The previous prime is 665616359. The next prime is 665616461. The reversal of 665616450 is 54616566.

It is a super-3 number, since 3×665616450³ (a number of 27 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 665616399 and 665616408.

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 11 ways as a sum of consecutive naturals, for example, 2218572 + ... + 2218871.

It is an arithmetic number, because the mean of its divisors is an integer number (68780382).

Almost surely, 2^665616450 is an apocalyptic number.

665616450 is an abundant number, since it is smaller than the sum of its proper divisors (985112718).

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

665616450 is a wasteful number, since it uses less digits than its factorization.

665616450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4437458 (or 4437453 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 665616450 is about 25799.5436006143. The cubic root of 665616450 is about 873.1214992634.

The spelling of 665616450 in words is "six hundred sixty-five million, six hundred sixteen thousand, four hundred fifty".