27661748993 has 2 divisors, whose sum is σ = 27661748994. Its totient is φ = 27661748992.

The previous prime is 27661748981. The next prime is 27661748999. The reversal of 27661748993 is 39984716672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26702174464 + 959574529 = 163408^2 + 30977^2 .

It is a cyclic number.

It is not a de Polignac number, because 27661748993 - 2²² = 27657554689 is a prime.

It is not a weakly prime, because it can be changed into another prime (27661748999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13830874496 + 13830874497.

It is an arithmetic number, because the mean of its divisors is an integer number (13830874497).

Almost surely, 2^27661748993 is an apocalyptic number.

It is an amenable number.

27661748993 is a deficient number, since it is larger than the sum of its proper divisors (1).

27661748993 is an equidigital number, since it uses as much as digits as its factorization.

27661748993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27433728, while the sum is 62.

The spelling of 27661748993 in words is "twenty-seven billion, six hundred sixty-one million, seven hundred forty-eight thousand, nine hundred ninety-three".