66247417231 has 2 divisors, whose sum is σ = 66247417232. Its totient is φ = 66247417230.

The previous prime is 66247417217. The next prime is 66247417241. The reversal of 66247417231 is 13271474266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66247417231 - 2²³ = 66239028623 is a prime.

It is a super-2 number, since 2×66247417231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66247417241) 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, 33123708615 + 33123708616.

It is an arithmetic number, because the mean of its divisors is an integer number (33123708616).

Almost surely, 2^66247417231 is an apocalyptic number.

66247417231 is a deficient number, since it is larger than the sum of its proper divisors (1).

66247417231 is an equidigital number, since it uses as much as digits as its factorization.

66247417231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 43.

The spelling of 66247417231 in words is "sixty-six billion, two hundred forty-seven million, four hundred seventeen thousand, two hundred thirty-one".