27997415867 has 2 divisors, whose sum is σ = 27997415868. Its totient is φ = 27997415866.

The previous prime is 27997415863. The next prime is 27997415903. The reversal of 27997415867 is 76851479972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27997415867 - 2² = 27997415863 is a prime.

It is not a weakly prime, because it can be changed into another prime (27997415863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13998707933 + 13998707934.

It is an arithmetic number, because the mean of its divisors is an integer number (13998707934).

Almost surely, 2^27997415867 is an apocalyptic number.

27997415867 is a deficient number, since it is larger than the sum of its proper divisors (1).

27997415867 is an equidigital number, since it uses as much as digits as its factorization.

27997415867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53343360, while the sum is 65.

The spelling of 27997415867 in words is "twenty-seven billion, nine hundred ninety-seven million, four hundred fifteen thousand, eight hundred sixty-seven".