66537736787 has 2 divisors, whose sum is σ = 66537736788. Its totient is φ = 66537736786.

The previous prime is 66537736781. The next prime is 66537736829. The reversal of 66537736787 is 78763773566.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66537736787 is a prime.

It is not a weakly prime, because it can be changed into another prime (66537736781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33268868393 + 33268868394.

It is an arithmetic number, because the mean of its divisors is an integer number (33268868394).

Almost surely, 2^66537736787 is an apocalyptic number.

66537736787 is a deficient number, since it is larger than the sum of its proper divisors (1).

66537736787 is an equidigital number, since it uses as much as digits as its factorization.

66537736787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186701760, while the sum is 65.

The spelling of 66537736787 in words is "sixty-six billion, five hundred thirty-seven million, seven hundred thirty-six thousand, seven hundred eighty-seven".