66131081576 has 64 divisors (see below), whose sum is σ = 146426311680. Its totient is φ = 27400343040.

The previous prime is 66131081531. The next prime is 66131081593. The reversal of 66131081576 is 67518013166.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1774850 + ... + 1811726.

It is an arithmetic number, because the mean of its divisors is an integer number (2287911120).

Almost surely, 2^66131081576 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 66131081576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73213155840).

66131081576 is an abundant number, since it is smaller than the sum of its proper divisors (80295230104).

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

66131081576 is a wasteful number, since it uses less digits than its factorization.

66131081576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37954 (or 37950 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 66131081576 in words is "sixty-six billion, one hundred thirty-one million, eighty-one thousand, five hundred seventy-six".