243426665407 has 2 divisors, whose sum is σ = 243426665408. Its totient is φ = 243426665406.

The previous prime is 243426665371. The next prime is 243426665437. The reversal of 243426665407 is 704566624342.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243426665407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243426665437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121713332703 + 121713332704.

It is an arithmetic number, because the mean of its divisors is an integer number (121713332704).

Almost surely, 2^243426665407 is an apocalyptic number.

243426665407 is a deficient number, since it is larger than the sum of its proper divisors (1).

243426665407 is an equidigital number, since it uses as much as digits as its factorization.

243426665407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5806080, while the sum is 49.

The spelling of 243426665407 in words is "two hundred forty-three billion, four hundred twenty-six million, six hundred sixty-five thousand, four hundred seven".