243161476261 has 4 divisors (see below), whose sum is σ = 265267065024. Its totient is φ = 221055887500.

The previous prime is 243161476253. The next prime is 243161476289. The reversal of 243161476261 is 162674161342.

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 a cyclic number.

It is not a de Polignac number, because 243161476261 - 2³ = 243161476253 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 (243161476361) 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, 11052794365 + ... + 11052794386.

It is an arithmetic number, because the mean of its divisors is an integer number (66316766256).

Almost surely, 2^243161476261 is an apocalyptic number.

It is an amenable number.

243161476261 is a deficient number, since it is larger than the sum of its proper divisors (22105588763).

243161476261 is a wasteful number, since it uses less digits than its factorization.

243161476261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22105588762.

The product of its digits is 290304, while the sum is 43.

The spelling of 243161476261 in words is "two hundred forty-three billion, one hundred sixty-one million, four hundred seventy-six thousand, two hundred sixty-one".