664526943 has 16 divisors (see below), whose sum is σ = 1016243200. Its totient is φ = 428726520.

The previous prime is 664526927. The next prime is 664526953. The reversal of 664526943 is 349625466.

It is not a de Polignac number, because 664526943 - 2⁴ = 664526927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664526953) 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, 396133 + ... + 397806.

It is an arithmetic number, because the mean of its divisors is an integer number (63515200).

Almost surely, 2^664526943 is an apocalyptic number.

664526943 is a deficient number, since it is larger than the sum of its proper divisors (351716257).

664526943 is a wasteful number, since it uses less digits than its factorization.

664526943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793979 (or 793973 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The square root of 664526943 is about 25778.4201028690. The cubic root of 664526943 is about 872.6448526480.

The spelling of 664526943 in words is "six hundred sixty-four million, five hundred twenty-six thousand, nine hundred forty-three".