664299075 has 72 divisors (see below), whose sum is σ = 1225421568. Its totient is φ = 317240000.

The previous prime is 664299059. The next prime is 664299079. The reversal of 664299075 is 570992466.

664299075 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 25774²-1.

It is not a de Polignac number, because 664299075 - 2⁴ = 664299059 is a prime.

It is a super-2 number, since 2×664299075² = 882586522091711250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664299079) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 643810 + ... + 644840.

It is an arithmetic number, because the mean of its divisors is an integer number (17019744).

Almost surely, 2^664299075 is an apocalyptic number.

664299075 is a deficient number, since it is larger than the sum of its proper divisors (561122493).

664299075 is a wasteful number, since it uses less digits than its factorization.

664299075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137 (or 1121 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 48.

The square root of 664299075 is about 25773.9999806006. Note that the first 4 decimals coincide. The cubic root of 664299075 is about 872.5450971893.

The spelling of 664299075 in words is "six hundred sixty-four million, two hundred ninety-nine thousand, seventy-five".