66176768840 has 512 divisors, whose sum is σ = 195920363520. Its totient is φ = 19564167168.

The previous prime is 66176768821. The next prime is 66176768869. The reversal of 66176768840 is 4886767166.

66176768840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 66176768840.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 521076857 + ... + 521076983.

It is an arithmetic number, because the mean of its divisors is an integer number (382656960).

Almost surely, 2^66176768840 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 66176768840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97960181760).

66176768840 is an abundant number, since it is smaller than the sum of its proper divisors (129743594680).

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

66176768840 is a wasteful number, since it uses less digits than its factorization.

66176768840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 59.

The spelling of 66176768840 in words is "sixty-six billion, one hundred seventy-six million, seven hundred sixty-eight thousand, eight hundred forty".