243203240477 has 2 divisors, whose sum is σ = 243203240478. Its totient is φ = 243203240476.

The previous prime is 243203240429. The next prime is 243203240587. The reversal of 243203240477 is 774042302342.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126669080836 + 116534159641 = 355906^2 + 341371^2 .

It is a cyclic number.

It is not a de Polignac number, because 243203240477 - 2³² = 238908273181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243203240477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243203240417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121601620238 + 121601620239.

It is an arithmetic number, because the mean of its divisors is an integer number (121601620239).

Almost surely, 2^243203240477 is an apocalyptic number.

It is an amenable number.

243203240477 is a deficient number, since it is larger than the sum of its proper divisors (1).

243203240477 is an equidigital number, since it uses as much as digits as its factorization.

243203240477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 38.

The spelling of 243203240477 in words is "two hundred forty-three billion, two hundred three million, two hundred forty thousand, four hundred seventy-seven".