136661412331 has 2 divisors, whose sum is σ = 136661412332. Its totient is φ = 136661412330.

The previous prime is 136661412323. The next prime is 136661412359. The reversal of 136661412331 is 133214166631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 136661412331 - 2³ = 136661412323 is a prime.

It is a super-2 number, since 2×136661412331² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (136662412331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68330706165 + 68330706166.

It is an arithmetic number, because the mean of its divisors is an integer number (68330706166).

Almost surely, 2^136661412331 is an apocalyptic number.

136661412331 is a deficient number, since it is larger than the sum of its proper divisors (1).

136661412331 is an equidigital number, since it uses as much as digits as its factorization.

136661412331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 37.

Adding to 136661412331 its reverse (133214166631), we get a palindrome (269875578962).

The spelling of 136661412331 in words is "one hundred thirty-six billion, six hundred sixty-one million, four hundred twelve thousand, three hundred thirty-one".