665046431 has 16 divisors (see below), whose sum is σ = 767159808. Its totient is φ = 564732000.

The previous prime is 665046413. The next prime is 665046439. The reversal of 665046431 is 134640566.

It is not a de Polignac number, because 665046431 - 2⁶ = 665046367 is a prime.

It is a super-2 number, since 2×665046431² = 884573510771675522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665046391 and 665046400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665046439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 571256 + ... + 572418.

It is an arithmetic number, because the mean of its divisors is an integer number (47947488).

Almost surely, 2^665046431 is an apocalyptic number.

665046431 is a deficient number, since it is larger than the sum of its proper divisors (102113377).

665046431 is a wasteful number, since it uses less digits than its factorization.

665046431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1862.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 665046431 is about 25788.4941592176. The cubic root of 665046431 is about 872.8721875247.

Adding to 665046431 its reverse (134640566), we get a palindrome (799686997).

The spelling of 665046431 in words is "six hundred sixty-five million, forty-six thousand, four hundred thirty-one".