135866046840019 has 4 divisors (see below), whose sum is σ = 138093359083360. Its totient is φ = 133638734596680.

The previous prime is 135866046839989. The next prime is 135866046840211. The reversal of 135866046840019 is 910048640668531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135866046840019 is a prime.

It is a super-2 number, since 2×135866046840019² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (61), and also a Moran number because the ratio is a prime number: 2227312243279 = 135866046840019 / (1 + 3 + 5 + 8 + 6 + 6 + 0 + 4 + 6 + 8 + 4 + 0 + 0 + 1 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135866043840019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1113656121579 + ... + 1113656121700.

It is an arithmetic number, because the mean of its divisors is an integer number (34523339770840).

Almost surely, 2^{135866046840019} is an apocalyptic number.

135866046840019 is a deficient number, since it is larger than the sum of its proper divisors (2227312243341).

135866046840019 is an equidigital number, since it uses as much as digits as its factorization.

135866046840019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2227312243340.

The product of its (nonzero) digits is 29859840, while the sum is 61.

The spelling of 135866046840019 in words is "one hundred thirty-five trillion, eight hundred sixty-six billion, forty-six million, eight hundred forty thousand, nineteen".