66866694602752 has 480 divisors, whose sum is σ = 154141504312320. Its totient is φ = 28710202245120.

The previous prime is 66866694602657. The next prime is 66866694602861. The reversal of 66866694602752 is 25720649666866.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168429961018 + ... + 168429961414.

It is an arithmetic number, because the mean of its divisors is an integer number (321128133984).

Almost surely, 2^{66866694602752} 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 66866694602752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77070752156160).

66866694602752 is an abundant number, since it is smaller than the sum of its proper divisors (87274809709568).

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

66866694602752 is a wasteful number, since it uses less digits than its factorization.

66866694602752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865 (or 839 counting only the distinct ones).

The product of its (nonzero) digits is 1881169920, while the sum is 73.

The spelling of 66866694602752 in words is "sixty-six trillion, eight hundred sixty-six billion, six hundred ninety-four million, six hundred two thousand, seven hundred fifty-two".