665025431 has 16 divisors (see below), whose sum is σ = 805948416. Its totient is φ = 535683456.

The previous prime is 665025421. The next prime is 665025461. The reversal of 665025431 is 134520566.

It is not a de Polignac number, because 665025431 - 2¹⁰ = 665024407 is a prime.

It is a super-2 number, since 2×665025431² = 884517647753471522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665025421) 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, 82670 + ... + 90356.

It is an arithmetic number, because the mean of its divisors is an integer number (50371776).

Almost surely, 2^665025431 is an apocalyptic number.

665025431 is a deficient number, since it is larger than the sum of its proper divisors (140922985).

665025431 is a wasteful number, since it uses less digits than its factorization.

665025431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8438.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 665025431 is about 25788.0869976817. The cubic root of 665025431 is about 872.8629999412.

Adding to 665025431 its reverse (134520566), we get a palindrome (799545997).

The spelling of 665025431 in words is "six hundred sixty-five million, twenty-five thousand, four hundred thirty-one".