66166248644 has 12 divisors (see below), whose sum is σ = 117091957500. Its totient is φ = 32711403648.

The previous prime is 66166248601. The next prime is 66166248671. The reversal of 66166248644 is 44684266166.

It can be written as a sum of positive squares in 2 ways, for example, as 37767258244 + 28398990400 = 194338^2 + 168520^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92929769 + ... + 92930480.

It is an arithmetic number, because the mean of its divisors is an integer number (9757663125).

Almost surely, 2^66166248644 is an apocalyptic number.

It is an amenable number.

66166248644 is a deficient number, since it is larger than the sum of its proper divisors (50925708856).

66166248644 is a wasteful number, since it uses less digits than its factorization.

66166248644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185860342 (or 185860340 counting only the distinct ones).

The product of its digits is 7962624, while the sum is 53.

The spelling of 66166248644 in words is "sixty-six billion, one hundred sixty-six million, two hundred forty-eight thousand, six hundred forty-four".