66660211584 has 96 divisors (see below), whose sum is σ = 192268196640. Its totient is φ = 22168350720.

The previous prime is 66660211561. The next prime is 66660211609. The reversal of 66660211584 is 48511206666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 429384 + ... + 563640.

It is an arithmetic number, because the mean of its divisors is an integer number (2002793715).

Almost surely, 2^66660211584 is an apocalyptic number.

66660211584 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66660211584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96134098320).

66660211584 is an abundant number, since it is smaller than the sum of its proper divisors (125607985056).

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

66660211584 is a wasteful number, since it uses less digits than its factorization.

66660211584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134708 (or 134693 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 66660211584 in words is "sixty-six billion, six hundred sixty million, two hundred eleven thousand, five hundred eighty-four".