66930757178884 has 9 divisors (see below), whose sum is σ = 117128853696981. Its totient is φ = 33465370408320.

The previous prime is 66930757178851. The next prime is 66930757178893. The reversal of 66930757178884 is 48887175703966.

The square root of 66930757178884 is 8181122.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 15439225601284 + 51491531577600 = 3929278^2 + 7175760^2 .

It is a super-3 number, since 3×66930757178884³ (a number of 42 digits) contains 333 as substring.

It is a Duffinian number.

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 2 ways as a sum of consecutive naturals, for example, 14316964 + ... + 18407524.

Almost surely, 2^{66930757178884} is an apocalyptic number.

66930757178884 is the 8181122-nd square number.

It is an amenable number.

66930757178884 is a deficient number, since it is larger than the sum of its proper divisors (50198096518097).

66930757178884 is an frugal number, since it uses more digits than its factorization.

66930757178884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8181126 (or 4090563 counting only the distinct ones).

The product of its (nonzero) digits is 3413975040, while the sum is 79.

The spelling of 66930757178884 in words is "sixty-six trillion, nine hundred thirty billion, seven hundred fifty-seven million, one hundred seventy-eight thousand, eight hundred eighty-four".