66120445766563 has 8 divisors (see below), whose sum is σ = 68554038988800. Its totient is φ = 63705644770440.

The previous prime is 66120445766537. The next prime is 66120445766587. The reversal of 66120445766563 is 36566754402166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66120445766563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66120445766663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4698049363 + ... + 4698063436.

It is an arithmetic number, because the mean of its divisors is an integer number (8569254873600).

Almost surely, 2^{66120445766563} is an apocalyptic number.

66120445766563 is a deficient number, since it is larger than the sum of its proper divisors (2433593222237).

66120445766563 is a wasteful number, since it uses less digits than its factorization.

66120445766563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9396113057.

The product of its (nonzero) digits is 130636800, while the sum is 61.

The spelling of 66120445766563 in words is "sixty-six trillion, one hundred twenty billion, four hundred forty-five million, seven hundred sixty-six thousand, five hundred sixty-three".