27758586340981 has 2 divisors, whose sum is σ = 27758586340982. Its totient is φ = 27758586340980.

The previous prime is 27758586340967. The next prime is 27758586341029. The reversal of 27758586340981 is 18904368585772.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15554079025956 + 12204507315025 = 3943866^2 + 3493495^2 .

It is a cyclic number.

It is not a de Polignac number, because 27758586340981 - 2¹⁷ = 27758586209909 is a prime.

It is a super-2 number, since 2×27758586340981² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27758586343981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13879293170490 + 13879293170491.

It is an arithmetic number, because the mean of its divisors is an integer number (13879293170491).

It is a 1-persistent number, because it is pandigital, but 2⋅27758586340981 = 55517172681962 is not.

Almost surely, 2^{27758586340981} is an apocalyptic number.

It is an amenable number.

27758586340981 is a deficient number, since it is larger than the sum of its proper divisors (1).

27758586340981 is an equidigital number, since it uses as much as digits as its factorization.

27758586340981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 812851200, while the sum is 73.

The spelling of 27758586340981 in words is "twenty-seven trillion, seven hundred fifty-eight billion, five hundred eighty-six million, three hundred forty thousand, nine hundred eighty-one".