66957087061 has 2 divisors, whose sum is σ = 66957087062. Its totient is φ = 66957087060.

The previous prime is 66957087049. The next prime is 66957087139. The reversal of 66957087061 is 16078075966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46971892900 + 19985194161 = 216730^2 + 141369^2 .

It is a cyclic number.

It is not a de Polignac number, because 66957087061 - 2⁹ = 66957086549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66957086993 and 66957087011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66957087361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33478543530 + 33478543531.

It is an arithmetic number, because the mean of its divisors is an integer number (33478543531).

Almost surely, 2^66957087061 is an apocalyptic number.

It is an amenable number.

66957087061 is a deficient number, since it is larger than the sum of its proper divisors (1).

66957087061 is an equidigital number, since it uses as much as digits as its factorization.

66957087061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 66957087061 in words is "sixty-six billion, nine hundred fifty-seven million, eighty-seven thousand, sixty-one".