66567732109 has 2 divisors, whose sum is σ = 66567732110. Its totient is φ = 66567732108.

The previous prime is 66567732103. The next prime is 66567732113. The reversal of 66567732109 is 90123776566.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53016444009 + 13551288100 = 230253^2 + 116410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66567732109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66567732103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33283866054 + 33283866055.

It is an arithmetic number, because the mean of its divisors is an integer number (33283866055).

Almost surely, 2^66567732109 is an apocalyptic number.

It is an amenable number.

66567732109 is a deficient number, since it is larger than the sum of its proper divisors (1).

66567732109 is an equidigital number, since it uses as much as digits as its factorization.

66567732109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2857680, while the sum is 52.

The spelling of 66567732109 in words is "sixty-six billion, five hundred sixty-seven million, seven hundred thirty-two thousand, one hundred nine".