136643305867 has 4 divisors (see below), whose sum is σ = 136645072416. Its totient is φ = 136641539320.

The previous prime is 136643305861. The next prime is 136643305871. The reversal of 136643305867 is 768503346631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 768503346631 = 37957 ⋅20246683.

It is a cyclic number.

It is not a de Polignac number, because 136643305867 - 2³ = 136643305859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136643305861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 761668 + ... + 923809.

It is an arithmetic number, because the mean of its divisors is an integer number (34161268104).

Almost surely, 2^136643305867 is an apocalyptic number.

136643305867 is a deficient number, since it is larger than the sum of its proper divisors (1766549).

136643305867 is an equidigital number, since it uses as much as digits as its factorization.

136643305867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1766548.

The product of its (nonzero) digits is 6531840, while the sum is 52.

The spelling of 136643305867 in words is "one hundred thirty-six billion, six hundred forty-three million, three hundred five thousand, eight hundred sixty-seven".