131366436637 has 2 divisors, whose sum is σ = 131366436638. Its totient is φ = 131366436636.

The previous prime is 131366436541. The next prime is 131366436653. The reversal of 131366436637 is 736634663131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109715962756 + 21650473881 = 331234^2 + 147141^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131366436637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131366436137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65683218318 + 65683218319.

It is an arithmetic number, because the mean of its divisors is an integer number (65683218319).

Almost surely, 2^131366436637 is an apocalyptic number.

It is an amenable number.

131366436637 is a deficient number, since it is larger than the sum of its proper divisors (1).

131366436637 is an equidigital number, since it uses as much as digits as its factorization.

131366436637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328, while the sum is 49.

The spelling of 131366436637 in words is "one hundred thirty-one billion, three hundred sixty-six million, four hundred thirty-six thousand, six hundred thirty-seven".