66315687880 has 96 divisors (see below), whose sum is σ = 161753319360. Its totient is φ = 24458154240.

The previous prime is 66315687827. The next prime is 66315687881. The reversal of 66315687880 is 8878651366.

It is a super-3 number, since 3×66315687880³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (66315687881) 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 23 ways as a sum of consecutive naturals, for example, 6558909 + ... + 6569011.

It is an arithmetic number, because the mean of its divisors is an integer number (1684930410).

Almost surely, 2^66315687880 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66315687880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80876659680).

66315687880 is an abundant number, since it is smaller than the sum of its proper divisors (95437631480).

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

66315687880 is a wasteful number, since it uses less digits than its factorization.

66315687880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11111 (or 11094 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 58.

The spelling of 66315687880 in words is "sixty-six billion, three hundred fifteen million, six hundred eighty-seven thousand, eight hundred eighty".