27731654689 has 2 divisors, whose sum is σ = 27731654690. Its totient is φ = 27731654688.

The previous prime is 27731654663. The next prime is 27731654723. The reversal of 27731654689 is 98645613772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23442059664 + 4289595025 = 153108^2 + 65495^2 .

It is a cyclic number.

It is not a de Polignac number, because 27731654689 - 2³³ = 19141720097 is a prime.

It is not a weakly prime, because it can be changed into another prime (27731654609) 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, 13865827344 + 13865827345.

It is an arithmetic number, because the mean of its divisors is an integer number (13865827345).

Almost surely, 2^27731654689 is an apocalyptic number.

It is an amenable number.

27731654689 is a deficient number, since it is larger than the sum of its proper divisors (1).

27731654689 is an equidigital number, since it uses as much as digits as its factorization.

27731654689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15240960, while the sum is 58.

The spelling of 27731654689 in words is "twenty-seven billion, seven hundred thirty-one million, six hundred fifty-four thousand, six hundred eighty-nine".