66051516566664 has 64 divisors (see below), whose sum is σ = 187380188870400. Its totient is φ = 21548721713472.

The previous prime is 66051516566657. The next prime is 66051516566699. The reversal of 66051516566664 is 46666561515066.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

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 15 ways as a sum of consecutive naturals, for example, 3253118127 + ... + 3253138430.

It is an arithmetic number, because the mean of its divisors is an integer number (2927815451100).

Almost surely, 2^{66051516566664} is an apocalyptic number.

It is an amenable number.

66051516566664 is an abundant number, since it is smaller than the sum of its proper divisors (121328672303736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66051516566664 is a wasteful number, since it uses less digits than its factorization.

66051516566664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6506256619 (or 6506256609 counting only the distinct ones).

The product of its (nonzero) digits is 139968000, while the sum is 63.

The spelling of 66051516566664 in words is "sixty-six trillion, fifty-one billion, five hundred sixteen million, five hundred sixty-six thousand, six hundred sixty-four".