664353431 has 8 divisors (see below), whose sum is σ = 785442720. Its totient is φ = 549809568.

The previous prime is 664353427. The next prime is 664353433. The reversal of 664353431 is 134353466.

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

It is not a de Polignac number, because 664353431 - 2² = 664353427 is a prime.

It is a super-2 number, since 2×664353431² = 882730962562943522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664353391 and 664353400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664353433) 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, 1636136 + ... + 1636541.

It is an arithmetic number, because the mean of its divisors is an integer number (98180340).

Almost surely, 2^664353431 is an apocalyptic number.

664353431 is a deficient number, since it is larger than the sum of its proper divisors (121089289).

664353431 is a wasteful number, since it uses less digits than its factorization.

664353431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3272713.

The product of its digits is 77760, while the sum is 35.

The square root of 664353431 is about 25775.0544325322. The cubic root of 664353431 is about 872.5688950887.

Adding to 664353431 its sum of digits (35), we get a palindrome (664353466).

The spelling of 664353431 in words is "six hundred sixty-four million, three hundred fifty-three thousand, four hundred thirty-one".