231816337661 has 2 divisors, whose sum is σ = 231816337662. Its totient is φ = 231816337660.

The previous prime is 231816337603. The next prime is 231816337667. The reversal of 231816337661 is 166733618132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126000151225 + 105816186436 = 354965^2 + 325294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231816337661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231816337667) 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, 115908168830 + 115908168831.

It is an arithmetic number, because the mean of its divisors is an integer number (115908168831).

Almost surely, 2^231816337661 is an apocalyptic number.

It is an amenable number.

231816337661 is a deficient number, since it is larger than the sum of its proper divisors (1).

231816337661 is an equidigital number, since it uses as much as digits as its factorization.

231816337661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 47.

It can be divided in two parts, 23181 and 6337661, that multiplied together give a palindrome (146913319641).

The spelling of 231816337661 in words is "two hundred thirty-one billion, eight hundred sixteen million, three hundred thirty-seven thousand, six hundred sixty-one".