27991673093 has 2 divisors, whose sum is σ = 27991673094. Its totient is φ = 27991673092.

The previous prime is 27991673029. The next prime is 27991673113. The reversal of 27991673093 is 39037619972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27915058084 + 76615009 = 167078^2 + 8753^2 .

It is a cyclic number.

It is not a de Polignac number, because 27991673093 - 2⁶ = 27991673029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27991643093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13995836546 + 13995836547.

It is an arithmetic number, because the mean of its divisors is an integer number (13995836547).

Almost surely, 2^27991673093 is an apocalyptic number.

It is an amenable number.

27991673093 is a deficient number, since it is larger than the sum of its proper divisors (1).

27991673093 is an equidigital number, since it uses as much as digits as its factorization.

27991673093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3857868, while the sum is 56.

The spelling of 27991673093 in words is "twenty-seven billion, nine hundred ninety-one million, six hundred seventy-three thousand, ninety-three".