66565111061 has 2 divisors, whose sum is σ = 66565111062. Its totient is φ = 66565111060.

The previous prime is 66565111033. The next prime is 66565111103. The reversal of 66565111061 is 16011156566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62505000100 + 4060110961 = 250010^2 + 63719^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66565111061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66565111861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33282555530 + 33282555531.

It is an arithmetic number, because the mean of its divisors is an integer number (33282555531).

Almost surely, 2^66565111061 is an apocalyptic number.

It is an amenable number.

66565111061 is a deficient number, since it is larger than the sum of its proper divisors (1).

66565111061 is an equidigital number, since it uses as much as digits as its factorization.

66565111061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 66565111061 in words is "sixty-six billion, five hundred sixty-five million, one hundred eleven thousand, sixty-one".