164236556515543 has 4 divisors (see below), whose sum is σ = 173897530428240. Its totient is φ = 154575582602848.

The previous prime is 164236556515501. The next prime is 164236556515613. The reversal of 164236556515543 is 345515655632461.

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-164236556515543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164236556513543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4830486956323 + ... + 4830486956356.

It is an arithmetic number, because the mean of its divisors is an integer number (43474382607060).

Almost surely, 2^{164236556515543} is an apocalyptic number.

164236556515543 is a deficient number, since it is larger than the sum of its proper divisors (9660973912697).

164236556515543 is an equidigital number, since it uses as much as digits as its factorization.

164236556515543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9660973912696.

The product of its digits is 194400000, while the sum is 61.

The spelling of 164236556515543 in words is "one hundred sixty-four trillion, two hundred thirty-six billion, five hundred fifty-six million, five hundred fifteen thousand, five hundred forty-three".