243630362551 has 2 divisors, whose sum is σ = 243630362552. Its totient is φ = 243630362550.

The previous prime is 243630362539. The next prime is 243630362567. The reversal of 243630362551 is 155263036342.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243630362551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243630362531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121815181275 + 121815181276.

It is an arithmetic number, because the mean of its divisors is an integer number (121815181276).

Almost surely, 2^243630362551 is an apocalyptic number.

243630362551 is a deficient number, since it is larger than the sum of its proper divisors (1).

243630362551 is an equidigital number, since it uses as much as digits as its factorization.

243630362551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 40.

Adding to 243630362551 its reverse (155263036342), we get a palindrome (398893398893).

The spelling of 243630362551 in words is "two hundred forty-three billion, six hundred thirty million, three hundred sixty-two thousand, five hundred fifty-one".