664240943 has 16 divisors (see below), whose sum is σ = 709753536. Its totient is φ = 620294400.

The previous prime is 664240921. The next prime is 664240979. The reversal of 664240943 is 349042466.

It is a cyclic number.

It is not a de Polignac number, because 664240943 - 2⁶ = 664240879 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664240897 and 664240906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664230943) 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 15 ways as a sum of consecutive naturals, for example, 167621 + ... + 171537.

It is an arithmetic number, because the mean of its divisors is an integer number (44359596).

Almost surely, 2^664240943 is an apocalyptic number.

664240943 is a deficient number, since it is larger than the sum of its proper divisors (45512593).

664240943 is a wasteful number, since it uses less digits than its factorization.

664240943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4114.

The product of its (nonzero) digits is 124416, while the sum is 38.

The square root of 664240943 is about 25772.8722303122. The cubic root of 664240943 is about 872.5196446619.

The spelling of 664240943 in words is "six hundred sixty-four million, two hundred forty thousand, nine hundred forty-three".