66176804644 has 24 divisors (see below), whose sum is σ = 116336868480. Its totient is φ = 32937802464.

The previous prime is 66176804633. The next prime is 66176804669. The reversal of 66176804644 is 44640867166.

It is a junction number, because it is equal to n+sod(n) for n = 66176804591 and 66176804600.

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 7 ways as a sum of consecutive naturals, for example, 2936122 + ... + 2958574.

It is an arithmetic number, because the mean of its divisors is an integer number (4847369520).

Almost surely, 2^66176804644 is an apocalyptic number.

It is an amenable number.

66176804644 is a deficient number, since it is larger than the sum of its proper divisors (50160063836).

66176804644 is a wasteful number, since it uses less digits than its factorization.

66176804644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25779 (or 25777 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 52.

The spelling of 66176804644 in words is "sixty-six billion, one hundred seventy-six million, eight hundred four thousand, six hundred forty-four".