66078078184 has 8 divisors (see below), whose sum is σ = 123896396610. Its totient is φ = 33039039088.

The previous prime is 66078078173. The next prime is 66078078233. The reversal of 66078078184 is 48187087066.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 60905304100 + 5172774084 = 246790^2 + 71922^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4129879879 + ... + 4129879894.

Almost surely, 2^66078078184 is an apocalyptic number.

It is an amenable number.

66078078184 is a deficient number, since it is larger than the sum of its proper divisors (57818318426).

66078078184 is a wasteful number, since it uses less digits than its factorization.

66078078184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8259759779 (or 8259759775 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 55.

The spelling of 66078078184 in words is "sixty-six billion, seventy-eight million, seventy-eight thousand, one hundred eighty-four".