66788655688768 has 112 divisors (see below), whose sum is σ = 151070740824640. Its totient is φ = 29041792358400.
The previous prime is 66788655688753. The next prime is 66788655688817. The reversal of 66788655688768 is 86788655688766.
It is an unprimeable number.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8809998 + ... + 14532493.
It is an arithmetic number, because the mean of its divisors is an integer number (1348845900220).
Almost surely, 266788655688768 is an apocalyptic number.
It is an amenable number.
66788655688768 is an abundant number, since it is smaller than the sum of its proper divisors (84282085135872).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
66788655688768 is a wasteful number, since it uses less digits than its factorization.
66788655688768 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 23342716 (or 23342706 counting only the distinct ones).
The product of its digits is 312134860800, while the sum is 94.
The spelling of 66788655688768 in words is "sixty-six trillion, seven hundred eighty-eight billion, six hundred fifty-five million, six hundred eighty-eight thousand, seven hundred sixty-eight".
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