66600536831 has 2 divisors, whose sum is σ = 66600536832. Its totient is φ = 66600536830.

The previous prime is 66600536813. The next prime is 66600536839. The reversal of 66600536831 is 13863500666.

Together with previous prime (66600536813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66600536831 - 2⁶ = 66600536767 is a prime.

It is a super-3 number, since 3×66600536831³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66600536839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33300268415 + 33300268416.

It is an arithmetic number, because the mean of its divisors is an integer number (33300268416).

Almost surely, 2^66600536831 is an apocalyptic number.

66600536831 is a deficient number, since it is larger than the sum of its proper divisors (1).

66600536831 is an equidigital number, since it uses as much as digits as its factorization.

66600536831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 44.

The spelling of 66600536831 in words is "sixty-six billion, six hundred million, five hundred thirty-six thousand, eight hundred thirty-one".