27121684553647 has 2 divisors, whose sum is σ = 27121684553648. Its totient is φ = 27121684553646.

The previous prime is 27121684553429. The next prime is 27121684553653. The reversal of 27121684553647 is 74635548612172.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27121684553647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27121684553347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13560842276823 + 13560842276824.

It is an arithmetic number, because the mean of its divisors is an integer number (13560842276824).

Almost surely, 2^{27121684553647} is an apocalyptic number.

27121684553647 is a deficient number, since it is larger than the sum of its proper divisors (1).

27121684553647 is an equidigital number, since it uses as much as digits as its factorization.

27121684553647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67737600, while the sum is 61.

The spelling of 27121684553647 in words is "twenty-seven trillion, one hundred twenty-one billion, six hundred eighty-four million, five hundred fifty-three thousand, six hundred forty-seven".