6646587900959 has 4 divisors (see below), whose sum is σ = 6707565771720. Its totient is φ = 6585610030200.

The previous prime is 6646587900929. The next prime is 6646587901027. The reversal of 6646587900959 is 9590097856466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6646587900959 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 (6646587900929) 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, 30488935217 + ... + 30488935434.

It is an arithmetic number, because the mean of its divisors is an integer number (1676891442930).

Almost surely, 2^{6646587900959} is an apocalyptic number.

6646587900959 is a deficient number, since it is larger than the sum of its proper divisors (60977870761).

6646587900959 is a wasteful number, since it uses less digits than its factorization.

6646587900959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60977870760.

The product of its (nonzero) digits is 881798400, while the sum is 74.

The spelling of 6646587900959 in words is "six trillion, six hundred forty-six billion, five hundred eighty-seven million, nine hundred thousand, nine hundred fifty-nine".