66511678066304 has 16 divisors (see below), whose sum is σ = 132503733647970. Its totient is φ = 33255839033088.

The previous prime is 66511678066291. The next prime is 66511678066313. The reversal of 66511678066304 is 40366087611566.

It can be written as a sum of positive squares in only one way, i.e., 48879673960000 + 17632004106304 = 6991400^2 + 4199048^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259811242319 + ... + 259811242574.

Almost surely, 2^{66511678066304} is an apocalyptic number.

66511678066304 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66511678066304 is a deficient number, since it is larger than the sum of its proper divisors (65992055581666).

66511678066304 is an equidigital number, since it uses as much as digits as its factorization.

66511678066304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519622484907 (or 519622484895 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 59.

The spelling of 66511678066304 in words is "sixty-six trillion, five hundred eleven billion, six hundred seventy-eight million, sixty-six thousand, three hundred four".