66656089584 has 120 divisors (see below), whose sum is σ = 217729873920. Its totient is φ = 18639379584.

The previous prime is 66656089559. The next prime is 66656089597. The reversal of 66656089584 is 48598065666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 656104 + ... + 750855.

It is an arithmetic number, because the mean of its divisors is an integer number (1814415616).

Almost surely, 2^66656089584 is an apocalyptic number.

It is an amenable number.

66656089584 is an abundant number, since it is smaller than the sum of its proper divisors (151073784336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66656089584 is a wasteful number, since it uses less digits than its factorization.

66656089584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407027 (or 1407018 counting only the distinct ones).

The product of its (nonzero) digits is 74649600, while the sum is 63.

The spelling of 66656089584 in words is "sixty-six billion, six hundred fifty-six million, eighty-nine thousand, five hundred eighty-four".