665635442 has 16 divisors (see below), whose sum is σ = 1081773792. Its totient is φ = 305954880.

The previous prime is 665635403. The next prime is 665635457. The reversal of 665635442 is 244536566.

It is a happy number.

665635442 is nontrivially palindromic in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 665635442.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226184 + ... + 229107.

It is an arithmetic number, because the mean of its divisors is an integer number (67610862).

Almost surely, 2^665635442 is an apocalyptic number.

665635442 is a deficient number, since it is larger than the sum of its proper divisors (416138350).

665635442 is a wasteful number, since it uses less digits than its factorization.

665635442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455353.

The product of its digits is 518400, while the sum is 41.

The square root of 665635442 is about 25799.9116665154. The cubic root of 665635442 is about 873.1298034281.

The spelling of 665635442 in words is "six hundred sixty-five million, six hundred thirty-five thousand, four hundred forty-two".