66016065056664 has 64 divisors (see below), whose sum is σ = 165120374016000. Its totient is φ = 21994661306240.

The previous prime is 66016065056593. The next prime is 66016065056671. The reversal of 66016065056664 is 46665056061066.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1800207049 + ... + 1800243719.

It is an arithmetic number, because the mean of its divisors is an integer number (2580005844000).

Almost surely, 2^{66016065056664} is an apocalyptic number.

It is an amenable number.

66016065056664 is an abundant number, since it is smaller than the sum of its proper divisors (99104308959336).

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

66016065056664 is a wasteful number, since it uses less digits than its factorization.

66016065056664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71088 (or 71084 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 57.

The spelling of 66016065056664 in words is "sixty-six trillion, sixteen billion, sixty-five million, fifty-six thousand, six hundred sixty-four".