27955155155989 has 2 divisors, whose sum is σ = 27955155155990. Its totient is φ = 27955155155988.

The previous prime is 27955155155981. The next prime is 27955155156023. The reversal of 27955155155989 is 98955155155972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18041681002500 + 9913474153489 = 4247550^2 + 3148567^2 .

It is a cyclic number.

It is not a de Polignac number, because 27955155155989 - 2³ = 27955155155981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27955155155981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13977577577994 + 13977577577995.

It is an arithmetic number, because the mean of its divisors is an integer number (13977577577995).

Almost surely, 2^{27955155155989} is an apocalyptic number.

It is an amenable number.

27955155155989 is a deficient number, since it is larger than the sum of its proper divisors (1).

27955155155989 is an equidigital number, since it uses as much as digits as its factorization.

27955155155989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1275750000, while the sum is 76.

The spelling of 27955155155989 in words is "twenty-seven trillion, nine hundred fifty-five billion, one hundred fifty-five million, one hundred fifty-five thousand, nine hundred eighty-nine".