66527072509 has 2 divisors, whose sum is σ = 66527072510. Its totient is φ = 66527072508.

The previous prime is 66527072483. The next prime is 66527072551. The reversal of 66527072509 is 90527072566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39303062500 + 27224010009 = 198250^2 + 164997^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66527072509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66527072809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33263536254 + 33263536255.

It is an arithmetic number, because the mean of its divisors is an integer number (33263536255).

Almost surely, 2^66527072509 is an apocalyptic number.

It is an amenable number.

66527072509 is a deficient number, since it is larger than the sum of its proper divisors (1).

66527072509 is an equidigital number, since it uses as much as digits as its factorization.

66527072509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1587600, while the sum is 49.

The spelling of 66527072509 in words is "sixty-six billion, five hundred twenty-seven million, seventy-two thousand, five hundred nine".