664788858801 has 4 divisors (see below), whose sum is σ = 886385145072. Its totient is φ = 443192572532.

The previous prime is 664788858751. The next prime is 664788858827. The reversal of 664788858801 is 108858887466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664788858801 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (664788858841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110798143131 + ... + 110798143136.

It is an arithmetic number, because the mean of its divisors is an integer number (221596286268).

Almost surely, 2^664788858801 is an apocalyptic number.

It is an amenable number.

664788858801 is a deficient number, since it is larger than the sum of its proper divisors (221596286271).

664788858801 is a wasteful number, since it uses less digits than its factorization.

664788858801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221596286270.

The product of its (nonzero) digits is 165150720, while the sum is 69.

The spelling of 664788858801 in words is "six hundred sixty-four billion, seven hundred eighty-eight million, eight hundred fifty-eight thousand, eight hundred one".