664789526 has 16 divisors (see below), whose sum is σ = 1020309696. Its totient is φ = 324712896.

The previous prime is 664789523. The next prime is 664789627. The reversal of 664789526 is 625987466.

It is a super-2 number, since 2×664789526² = 883890227758609352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664789523) 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, 46010 + ... + 58706.

It is an arithmetic number, because the mean of its divisors is an integer number (63769356).

Almost surely, 2^664789526 is an apocalyptic number.

664789526 is a deficient number, since it is larger than the sum of its proper divisors (355520170).

664789526 is a wasteful number, since it uses less digits than its factorization.

664789526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13303.

The product of its digits is 4354560, while the sum is 53.

The square root of 664789526 is about 25783.5126776783. The cubic root of 664789526 is about 872.7597772728.

The spelling of 664789526 in words is "six hundred sixty-four million, seven hundred eighty-nine thousand, five hundred twenty-six".