27624527981 has 2 divisors, whose sum is σ = 27624527982. Its totient is φ = 27624527980.

The previous prime is 27624527933. The next prime is 27624528007. The reversal of 27624527981 is 18972542672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22931044900 + 4693483081 = 151430^2 + 68509^2 .

It is a cyclic number.

It is not a de Polignac number, because 27624527981 - 2²⁶ = 27557419117 is a prime.

It is a super-2 number, since 2×27624527981² (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 (27624527681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13812263990 + 13812263991.

It is an arithmetic number, because the mean of its divisors is an integer number (13812263991).

Almost surely, 2^27624527981 is an apocalyptic number.

It is an amenable number.

27624527981 is a deficient number, since it is larger than the sum of its proper divisors (1).

27624527981 is an equidigital number, since it uses as much as digits as its factorization.

27624527981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 53.

The spelling of 27624527981 in words is "twenty-seven billion, six hundred twenty-four million, five hundred twenty-seven thousand, nine hundred eighty-one".