27506491643 has 2 divisors, whose sum is σ = 27506491644. Its totient is φ = 27506491642.

The previous prime is 27506491613. The next prime is 27506491687. The reversal of 27506491643 is 34619460572.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27506491643 - 2¹⁴ = 27506475259 is a prime.

It is not a weakly prime, because it can be changed into another prime (27506491603) 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, 13753245821 + 13753245822.

It is an arithmetic number, because the mean of its divisors is an integer number (13753245822).

Almost surely, 2^27506491643 is an apocalyptic number.

27506491643 is a deficient number, since it is larger than the sum of its proper divisors (1).

27506491643 is an equidigital number, since it uses as much as digits as its factorization.

27506491643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 27506491643 in words is "twenty-seven billion, five hundred six million, four hundred ninety-one thousand, six hundred forty-three".