66860644752 has 360 divisors, whose sum is σ = 218135725920. Its totient is φ = 19607227200.

The previous prime is 66860644733. The next prime is 66860644769. The reversal of 66860644752 is 25744606866.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 71 ways as a sum of consecutive naturals, for example, 2156794977 + ... + 2156795007.

It is an arithmetic number, because the mean of its divisors is an integer number (605932572).

Almost surely, 2^66860644752 is an apocalyptic number.

66860644752 is a gapful number since it is divisible by the number (62) 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 66860644752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109067862960).

66860644752 is an abundant number, since it is smaller than the sum of its proper divisors (151275081168).

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

66860644752 is an frugal number, since it uses more digits than its factorization.

66860644752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 54.

The spelling of 66860644752 in words is "sixty-six billion, eight hundred sixty million, six hundred forty-four thousand, seven hundred fifty-two".