243641781155 has 4 divisors (see below), whose sum is σ = 292370137392. Its totient is φ = 194913424920.

The previous prime is 243641781139. The next prime is 243641781157. The reversal of 243641781155 is 551187146342.

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

It is not a de Polignac number, because 243641781155 - 2⁴ = 243641781139 is a prime.

It is a super-2 number, since 2×243641781155² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243641781157) 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, 24364178111 + ... + 24364178120.

It is an arithmetic number, because the mean of its divisors is an integer number (73092534348).

Almost surely, 2^243641781155 is an apocalyptic number.

243641781155 is a deficient number, since it is larger than the sum of its proper divisors (48728356237).

243641781155 is an equidigital number, since it uses as much as digits as its factorization.

243641781155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48728356236.

The product of its digits is 806400, while the sum is 47.

The spelling of 243641781155 in words is "two hundred forty-three billion, six hundred forty-one million, seven hundred eighty-one thousand, one hundred fifty-five".