66075565526161 has 8 divisors (see below), whose sum is σ = 66733766763048. Its totient is φ = 65417442480000.

The previous prime is 66075565526149. The next prime is 66075565526167. The reversal of 66075565526161 is 16162556557066.

It can be written as a sum of positive squares in 4 ways, for example, as 57462843180625 + 8612722345536 = 7580425^2 + 2934744^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66075565526161 - 2¹¹ = 66075565524113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66075565526161.

It is not an unprimeable number, because it can be changed into a prime (66075565526167) 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, 17848420 + ... + 21230101.

It is an arithmetic number, because the mean of its divisors is an integer number (8341720845381).

Almost surely, 2^{66075565526161} is an apocalyptic number.

It is an amenable number.

66075565526161 is a deficient number, since it is larger than the sum of its proper divisors (658201236887).

66075565526161 is a wasteful number, since it uses less digits than its factorization.

66075565526161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39095363.

The product of its (nonzero) digits is 68040000, while the sum is 61.

The spelling of 66075565526161 in words is "sixty-six trillion, seventy-five billion, five hundred sixty-five million, five hundred twenty-six thousand, one hundred sixty-one".