66239837687 has 2 divisors, whose sum is σ = 66239837688. Its totient is φ = 66239837686.

The previous prime is 66239837611. The next prime is 66239837767. The reversal of 66239837687 is 78673893266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66239837687 - 2¹² = 66239833591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66239837087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33119918843 + 33119918844.

It is an arithmetic number, because the mean of its divisors is an integer number (33119918844).

Almost surely, 2^66239837687 is an apocalyptic number.

66239837687 is a deficient number, since it is larger than the sum of its proper divisors (1).

66239837687 is an equidigital number, since it uses as much as digits as its factorization.

66239837687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 109734912, while the sum is 65.

The spelling of 66239837687 in words is "sixty-six billion, two hundred thirty-nine million, eight hundred thirty-seven thousand, six hundred eighty-seven".