66876435440 has 80 divisors (see below), whose sum is σ = 156622788000. Its totient is φ = 26555682816.

The previous prime is 66876435421. The next prime is 66876435469. The reversal of 66876435440 is 4453467866.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

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, 13676516 + ... + 13681404.

It is an arithmetic number, because the mean of its divisors is an integer number (1957784850).

Almost surely, 2^66876435440 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 66876435440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78311394000).

66876435440 is an abundant number, since it is smaller than the sum of its proper divisors (89746352560).

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

66876435440 is a wasteful number, since it uses less digits than its factorization.

66876435440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6114 (or 6108 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 53.

The spelling of 66876435440 in words is "sixty-six billion, eight hundred seventy-six million, four hundred thirty-five thousand, four hundred forty".