665043433431 has 16 divisors (see below), whose sum is σ = 955611978720. Its totient is φ = 408967004160.

The previous prime is 665043433409. The next prime is 665043433433. The reversal of 665043433431 is 134334340566.

It is not a de Polignac number, because 665043433431 - 2⁶ = 665043433367 is a prime.

It is a super-2 number, since 2×665043433431² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665043433433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5996290 + ... + 6106191.

It is an arithmetic number, because the mean of its divisors is an integer number (59725748670).

Almost surely, 2^665043433431 is an apocalyptic number.

665043433431 is a deficient number, since it is larger than the sum of its proper divisors (290568545289).

665043433431 is a wasteful number, since it uses less digits than its factorization.

665043433431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12103906.

The product of its (nonzero) digits is 933120, while the sum is 42.

Adding to 665043433431 its reverse (134334340566), we get a palindrome (799377773997).

The spelling of 665043433431 in words is "six hundred sixty-five billion, forty-three million, four hundred thirty-three thousand, four hundred thirty-one".