665405448 has 48 divisors (see below), whose sum is σ = 1674742320. Its totient is φ = 220311936.

The previous prime is 665405443. The next prime is 665405453. The reversal of 665405448 is 844504566.

It is an interprime number because it is at equal distance from previous prime (665405443) and next prime (665405453).

It is not an unprimeable number, because it can be changed into a prime (665405443) by changing a digit.

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, 2125740 + ... + 2126052.

It is an arithmetic number, because the mean of its divisors is an integer number (34890465).

Almost surely, 2^665405448 is an apocalyptic number.

It is an amenable number.

665405448 is an abundant number, since it is smaller than the sum of its proper divisors (1009336872).

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

665405448 is a wasteful number, since it uses less digits than its factorization.

665405448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918 (or 601 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 42.

The square root of 665405448 is about 25795.4540181017. The cubic root of 665405448 is about 873.0292289811.

The spelling of 665405448 in words is "six hundred sixty-five million, four hundred five thousand, four hundred forty-eight".