665611431 has 8 divisors (see below), whose sum is σ = 887652864. Its totient is φ = 443655480.

The previous prime is 665611423. The next prime is 665611469. The reversal of 665611431 is 134116566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665611431 - 2³ = 665611423 is a prime.

It is a super-2 number, since 2×665611431² = 886077154155735522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665611392 and 665611401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665611481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205 + ... + 36486.

It is an arithmetic number, because the mean of its divisors is an integer number (110956608).

Almost surely, 2^665611431 is an apocalyptic number.

665611431 is a deficient number, since it is larger than the sum of its proper divisors (222041433).

665611431 is a wasteful number, since it uses less digits than its factorization.

665611431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42741.

The product of its digits is 12960, while the sum is 33.

The square root of 665611431 is about 25799.4463312684. The cubic root of 665611431 is about 873.1193047023.

Adding to 665611431 its reverse (134116566), we get a palindrome (799727997).

The spelling of 665611431 in words is "six hundred sixty-five million, six hundred eleven thousand, four hundred thirty-one".