66017240080561 has 12 divisors (see below), whose sum is σ = 83776979991600. Its totient is φ = 51442005257160.

The previous prime is 66017240080541. The next prime is 66017240080609. The reversal of 66017240080561 is 16508004271066.

It is not a de Polignac number, because 66017240080561 - 2¹⁵ = 66017240047793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66017240080541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61240481911 + ... + 61240482988.

It is an arithmetic number, because the mean of its divisors is an integer number (6981414999300).

Almost surely, 2^{66017240080561} is an apocalyptic number.

It is an amenable number.

66017240080561 is a deficient number, since it is larger than the sum of its proper divisors (17759739911039).

66017240080561 is a wasteful number, since it uses less digits than its factorization.

66017240080561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122480964924 (or 122480964917 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 66017240080561 in words is "sixty-six trillion, seventeen billion, two hundred forty million, eighty thousand, five hundred sixty-one".