243776372213 has 4 divisors (see below), whose sum is σ = 265937860608. Its totient is φ = 221614883820.

The previous prime is 243776372197. The next prime is 243776372243. The reversal of 243776372213 is 312273677342.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 243776372213 - 2⁴ = 243776372197 is a prime.

It is a super-2 number, since 2×243776372213² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243776372243) 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, 11080744181 + ... + 11080744202.

It is an arithmetic number, because the mean of its divisors is an integer number (66484465152).

Almost surely, 2^243776372213 is an apocalyptic number.

It is an amenable number.

243776372213 is a deficient number, since it is larger than the sum of its proper divisors (22161488395).

243776372213 is a wasteful number, since it uses less digits than its factorization.

243776372213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22161488394.

The product of its digits is 1778112, while the sum is 47.

The spelling of 243776372213 in words is "two hundred forty-three billion, seven hundred seventy-six million, three hundred seventy-two thousand, two hundred thirteen".