665423436 has 12 divisors (see below), whose sum is σ = 1552654712. Its totient is φ = 221807808.

The previous prime is 665423393. The next prime is 665423443. The reversal of 665423436 is 634324566.

665423436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 665423394 and 665423403.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27725965 + ... + 27725988.

Almost surely, 2^665423436 is an apocalyptic number.

It is an amenable number.

665423436 is an abundant number, since it is smaller than the sum of its proper divisors (887231276).

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

665423436 is a wasteful number, since it uses less digits than its factorization.

665423436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55451960 (or 55451958 counting only the distinct ones).

The product of its digits is 311040, while the sum is 39.

The square root of 665423436 is about 25795.8026818318. The cubic root of 665423436 is about 873.0370958180.

The spelling of 665423436 in words is "six hundred sixty-five million, four hundred twenty-three thousand, four hundred thirty-six".