136643566693 has 2 divisors, whose sum is σ = 136643566694. Its totient is φ = 136643566692.

The previous prime is 136643566687. The next prime is 136643566747. The reversal of 136643566693 is 396665346631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85694951169 + 50948615524 = 292737^2 + 225718^2 .

It is a cyclic number.

It is not a de Polignac number, because 136643566693 - 2¹³ = 136643558501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136643566793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68321783346 + 68321783347.

It is an arithmetic number, because the mean of its divisors is an integer number (68321783347).

Almost surely, 2^136643566693 is an apocalyptic number.

It is an amenable number.

136643566693 is a deficient number, since it is larger than the sum of its proper divisors (1).

136643566693 is an equidigital number, since it uses as much as digits as its factorization.

136643566693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37791360, while the sum is 58.

The spelling of 136643566693 in words is "one hundred thirty-six billion, six hundred forty-three million, five hundred sixty-six thousand, six hundred ninety-three".