664888797 has 32 divisors (see below), whose sum is σ = 997349760. Its totient is φ = 437748480.

The previous prime is 664888789. The next prime is 664888799. The reversal of 664888797 is 797888466.

664888797 is a `hidden beast` number, since 66 + 488 + 8 + 7 + 97 = 666.

It is not a de Polignac number, because 664888797 - 2³ = 664888789 is a prime.

It is a super-2 number, since 2×664888797² = 884154224752214418, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664888799) 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 31 ways as a sum of consecutive naturals, for example, 1120933 + ... + 1121525.

It is an arithmetic number, because the mean of its divisors is an integer number (31167180).

Almost surely, 2^664888797 is an apocalyptic number.

It is an amenable number.

664888797 is a deficient number, since it is larger than the sum of its proper divisors (332460963).

664888797 is a wasteful number, since it uses less digits than its factorization.

664888797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050 (or 1044 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 63.

The square root of 664888797 is about 25785.4376926202. The cubic root of 664888797 is about 872.8032172992.

The spelling of 664888797 in words is "six hundred sixty-four million, eight hundred eighty-eight thousand, seven hundred ninety-seven".