66668888668794 has 16 divisors (see below), whose sum is σ = 133438867404480. Its totient is φ = 22206114545120.

The previous prime is 66668888668787. The next prime is 66668888668841. The reversal of 66668888668794 is 49786688886666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4212077547 + ... + 4212093374.

It is an arithmetic number, because the mean of its divisors is an integer number (8339929212780).

Almost surely, 2^{66668888668794} is an apocalyptic number.

66668888668794 is an abundant number, since it is smaller than the sum of its proper divisors (66769978735686).

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

66668888668794 is a wasteful number, since it uses less digits than its factorization.

66668888668794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8424172245.

The product of its digits is 385263599616, while the sum is 96.

The spelling of 66668888668794 in words is "sixty-six trillion, six hundred sixty-eight billion, eight hundred eighty-eight million, six hundred sixty-eight thousand, seven hundred ninety-four".