665219044 has 36 divisors (see below), whose sum is σ = 1413319936. Its totient is φ = 268320384.

The previous prime is 665219029. The next prime is 665219047. The reversal of 665219044 is 440912566.

It is a junction number, because it is equal to n+sod(n) for n = 665218994 and 665219012.

It is not an unprimeable number, because it can be changed into a prime (665219047) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33012 + ... + 49195.

Almost surely, 2^665219044 is an apocalyptic number.

It is an amenable number.

665219044 is an abundant number, since it is smaller than the sum of its proper divisors (748100892).

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

665219044 is a wasteful number, since it uses less digits than its factorization.

665219044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82252 (or 82233 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 665219044 is about 25791.8406477708. The cubic root of 665219044 is about 872.9476990711.

The spelling of 665219044 in words is "six hundred sixty-five million, two hundred nineteen thousand, forty-four".