243306838436861 has 16 divisors (see below), whose sum is σ = 254646944294400. Its totient is φ = 232030352363568.

The previous prime is 243306838436821. The next prime is 243306838436939. The reversal of 243306838436861 is 168634838603342.

It is a cyclic number.

It is not a de Polignac number, because 243306838436861 - 2⁴² = 238908791925757 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 (243306838436821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66364670 + ... + 69934848.

It is an arithmetic number, because the mean of its divisors is an integer number (15915434018400).

Almost surely, 2^{243306838436861} is an apocalyptic number.

It is an amenable number.

243306838436861 is a deficient number, since it is larger than the sum of its proper divisors (11340105857539).

243306838436861 is a wasteful number, since it uses less digits than its factorization.

243306838436861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3579088.

The product of its (nonzero) digits is 286654464, while the sum is 65.

The spelling of 243306838436861 in words is "two hundred forty-three trillion, three hundred six billion, eight hundred thirty-eight million, four hundred thirty-six thousand, eight hundred sixty-one".