66188378072 has 8 divisors (see below), whose sum is σ = 124103208900. Its totient is φ = 33094189032.

The previous prime is 66188378057. The next prime is 66188378117. The reversal of 66188378072 is 27087388166.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 66188377999 and 66188378017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4136773622 + ... + 4136773637.

Almost surely, 2^66188378072 is an apocalyptic number.

It is an amenable number.

66188378072 is a deficient number, since it is larger than the sum of its proper divisors (57914830828).

66188378072 is a wasteful number, since it uses less digits than its factorization.

66188378072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8273547265 (or 8273547261 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 56.

The spelling of 66188378072 in words is "sixty-six billion, one hundred eighty-eight million, three hundred seventy-eight thousand, seventy-two".