665611432 has 8 divisors (see below), whose sum is σ = 1248021450. Its totient is φ = 332805712.

The previous prime is 665611423. The next prime is 665611469. The reversal of 665611432 is 234116566.

665611432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 643839876 + 21771556 = 25374^2 + 4666^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41600707 + ... + 41600722.

Almost surely, 2^665611432 is an apocalyptic number.

It is an amenable number.

665611432 is a deficient number, since it is larger than the sum of its proper divisors (582410018).

665611432 is a wasteful number, since it uses less digits than its factorization.

665611432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83201435 (or 83201431 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 665611432 is about 25799.4463506487. The cubic root of 665611432 is about 873.1193051396.

Adding to 665611432 its reverse (234116566), we get a palindrome (899727998).

The spelling of 665611432 in words is "six hundred sixty-five million, six hundred eleven thousand, four hundred thirty-two".