66684827880 has 864 divisors, whose sum is σ = 259594826400. Its totient is φ = 15379372800.

The previous prime is 66684827837. The next prime is 66684827887. The reversal of 66684827880 is 8872848666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66684827887) by changing a digit.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 1130251291 + ... + 1130251349.

It is an arithmetic number, because the mean of its divisors is an integer number (300456975).

Almost surely, 2^66684827880 is an apocalyptic number.

66684827880 is a gapful number since it is divisible by the number (60) 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 66684827880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129797413200).

66684827880 is an abundant number, since it is smaller than the sum of its proper divisors (192909998520).

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

66684827880 is a wasteful number, since it uses less digits than its factorization.

66684827880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 49545216, while the sum is 63.

The spelling of 66684827880 in words is "sixty-six billion, six hundred eighty-four million, eight hundred twenty-seven thousand, eight hundred eighty".