665431044 has 12 divisors (see below), whose sum is σ = 1552672464. Its totient is φ = 221810344.

The previous prime is 665431043. The next prime is 665431049. The reversal of 665431044 is 440134566.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 665430996 and 665431014.

It is not an unprimeable number, because it can be changed into a prime (665431043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27726282 + ... + 27726305.

It is an arithmetic number, because the mean of its divisors is an integer number (129389372).

Almost surely, 2^665431044 is an apocalyptic number.

It is an amenable number.

665431044 is an abundant number, since it is smaller than the sum of its proper divisors (887241420).

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

665431044 is a wasteful number, since it uses less digits than its factorization.

665431044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55452594 (or 55452592 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 665431044 is about 25795.9501472615. The cubic root of 665431044 is about 873.0404230432.

The spelling of 665431044 in words is "six hundred sixty-five million, four hundred thirty-one thousand, forty-four".