27973527643 has 2 divisors, whose sum is σ = 27973527644. Its totient is φ = 27973527642.

The previous prime is 27973527587. The next prime is 27973527653. The reversal of 27973527643 is 34672537972.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27973527643 is a prime.

It is not a weakly prime, because it can be changed into another prime (27973527653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13986763821 + 13986763822.

It is an arithmetic number, because the mean of its divisors is an integer number (13986763822).

Almost surely, 2^27973527643 is an apocalyptic number.

27973527643 is a deficient number, since it is larger than the sum of its proper divisors (1).

27973527643 is an equidigital number, since it uses as much as digits as its factorization.

27973527643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13335840, while the sum is 55.

The spelling of 27973527643 in words is "twenty-seven billion, nine hundred seventy-three million, five hundred twenty-seven thousand, six hundred forty-three".