27433297981 has 2 divisors, whose sum is σ = 27433297982. Its totient is φ = 27433297980.

The previous prime is 27433297961. The next prime is 27433298051. The reversal of 27433297981 is 18979233472.

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., 27393229081 + 40068900 = 165509^2 + 6330^2 .

It is a cyclic number.

It is not a de Polignac number, because 27433297981 - 2¹⁷ = 27433166909 is a prime.

It is a super-2 number, since 2×27433297981² (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 (27433297901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13716648990 + 13716648991.

It is an arithmetic number, because the mean of its divisors is an integer number (13716648991).

Almost surely, 2^27433297981 is an apocalyptic number.

It is an amenable number.

27433297981 is a deficient number, since it is larger than the sum of its proper divisors (1).

27433297981 is an equidigital number, since it uses as much as digits as its factorization.

27433297981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 55.

The spelling of 27433297981 in words is "twenty-seven billion, four hundred thirty-three million, two hundred ninety-seven thousand, nine hundred eighty-one".