51236543600243 has 4 divisors (see below), whose sum is σ = 51236683187040. Its totient is φ = 51236404013448.

The previous prime is 51236543600201. The next prime is 51236543600287. The reversal of 51236543600243 is 34200634563215.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51236543600243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51236543600194 and 51236543600203.

It is not an unprimeable number, because it can be changed into a prime (51236543603243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69241355 + ... + 69977412.

It is an arithmetic number, because the mean of its divisors is an integer number (12809170796760).

Almost surely, 2^{51236543600243} is an apocalyptic number.

51236543600243 is a deficient number, since it is larger than the sum of its proper divisors (139586797).

51236543600243 is a wasteful number, since it uses less digits than its factorization.

51236543600243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139586796.

The product of its (nonzero) digits is 1555200, while the sum is 44.

The spelling of 51236543600243 in words is "fifty-one trillion, two hundred thirty-six billion, five hundred forty-three million, six hundred thousand, two hundred forty-three".