664016431 has 16 divisors (see below), whose sum is σ = 729993600. Its totient is φ = 600275808.

The previous prime is 664016429. The next prime is 664016491. The reversal of 664016431 is 134610466.

664016431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 664016431 - 2¹ = 664016429 is a prime.

It is a super-2 number, since 2×664016431² = 881835641275955522, 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 = 664016393 and 664016402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664016491) 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, 153780 + ... + 158038.

It is an arithmetic number, because the mean of its divisors is an integer number (45624600).

Almost surely, 2^664016431 is an apocalyptic number.

664016431 is a deficient number, since it is larger than the sum of its proper divisors (65977169).

664016431 is a wasteful number, since it uses less digits than its factorization.

664016431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4518.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 664016431 is about 25768.5162747101. The cubic root of 664016431 is about 872.4213303343.

Adding to 664016431 its reverse (134610466), we get a palindrome (798626897).

The spelling of 664016431 in words is "six hundred sixty-four million, sixteen thousand, four hundred thirty-one".