66431527361 has 2 divisors, whose sum is σ = 66431527362. Its totient is φ = 66431527360.

The previous prime is 66431527307. The next prime is 66431527447. The reversal of 66431527361 is 16372513466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61394928400 + 5036598961 = 247780^2 + 70969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66431527361 is a prime.

It is not a weakly prime, because it can be changed into another prime (66431527061) 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, 33215763680 + 33215763681.

It is an arithmetic number, because the mean of its divisors is an integer number (33215763681).

Almost surely, 2^66431527361 is an apocalyptic number.

It is an amenable number.

66431527361 is a deficient number, since it is larger than the sum of its proper divisors (1).

66431527361 is an equidigital number, since it uses as much as digits as its factorization.

66431527361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 44.

The spelling of 66431527361 in words is "sixty-six billion, four hundred thirty-one million, five hundred twenty-seven thousand, three hundred sixty-one".