27133726981 has 2 divisors, whose sum is σ = 27133726982. Its totient is φ = 27133726980.

The previous prime is 27133726951. The next prime is 27133727041. The reversal of 27133726981 is 18962733172.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22094146881 + 5039580100 = 148641^2 + 70990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27133726981 is a prime.

It is a super-2 number, since 2×27133726981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27133726951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13566863490 + 13566863491.

It is an arithmetic number, because the mean of its divisors is an integer number (13566863491).

Almost surely, 2^27133726981 is an apocalyptic number.

It is an amenable number.

27133726981 is a deficient number, since it is larger than the sum of its proper divisors (1).

27133726981 is an equidigital number, since it uses as much as digits as its factorization.

27133726981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 49.

The spelling of 27133726981 in words is "twenty-seven billion, one hundred thirty-three million, seven hundred twenty-six thousand, nine hundred eighty-one".