27916972543081 has 2 divisors, whose sum is σ = 27916972543082. Its totient is φ = 27916972543080.

The previous prime is 27916972542961. The next prime is 27916972543151. The reversal of 27916972543081 is 18034527961972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20805603651856 + 7111368891225 = 4561316^2 + 2666715^2 .

It is a cyclic number.

It is not a de Polignac number, because 27916972543081 - 2²¹ = 27916970445929 is a prime.

It is a super-2 number, since 2×27916972543081² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27916972943081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13958486271540 + 13958486271541.

It is an arithmetic number, because the mean of its divisors is an integer number (13958486271541).

It is a 1-persistent number, because it is pandigital, but 2⋅27916972543081 = 55833945086162 is not.

Almost surely, 2^{27916972543081} is an apocalyptic number.

It is an amenable number.

27916972543081 is a deficient number, since it is larger than the sum of its proper divisors (1).

27916972543081 is an equidigital number, since it uses as much as digits as its factorization.

27916972543081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45722880, while the sum is 64.

The spelling of 27916972543081 in words is "twenty-seven trillion, nine hundred sixteen billion, nine hundred seventy-two million, five hundred forty-three thousand, eighty-one".