27788617820531 has 2 divisors, whose sum is σ = 27788617820532. Its totient is φ = 27788617820530.

The previous prime is 27788617820501. The next prime is 27788617820567. The reversal of 27788617820531 is 13502871688772.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27788617820531 is a prime.

It is a super-2 number, since 2×27788617820531² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27788617820501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13894308910265 + 13894308910266.

It is an arithmetic number, because the mean of its divisors is an integer number (13894308910266).

Almost surely, 2^{27788617820531} is an apocalyptic number.

27788617820531 is a deficient number, since it is larger than the sum of its proper divisors (1).

27788617820531 is an equidigital number, since it uses as much as digits as its factorization.

27788617820531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63221760, while the sum is 65.

The spelling of 27788617820531 in words is "twenty-seven trillion, seven hundred eighty-eight billion, six hundred seventeen million, eight hundred twenty thousand, five hundred thirty-one".