27751216543 has 2 divisors, whose sum is σ = 27751216544. Its totient is φ = 27751216542.

The previous prime is 27751216501. The next prime is 27751216589. The reversal of 27751216543 is 34561215772.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27751216543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27751216543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27751213543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13875608271 + 13875608272.

It is an arithmetic number, because the mean of its divisors is an integer number (13875608272).

Almost surely, 2^27751216543 is an apocalyptic number.

27751216543 is a deficient number, since it is larger than the sum of its proper divisors (1).

27751216543 is an equidigital number, since it uses as much as digits as its factorization.

27751216543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 43.

The spelling of 27751216543 in words is "twenty-seven billion, seven hundred fifty-one million, two hundred sixteen thousand, five hundred forty-three".