27991180068905 has 8 divisors (see below), whose sum is σ = 33597504096072. Its totient is φ = 22387552046208.

The previous prime is 27991180068893. The next prime is 27991180068923. The reversal of 27991180068905 is 50986008119972.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 241083946009 + 27750096122896 = 491003^2 + 5267836^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27991180068905 - 2⁴ = 27991180068889 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 673978274 + ... + 674019803.

It is an arithmetic number, because the mean of its divisors is an integer number (4199688012009).

Almost surely, 2^{27991180068905} is an apocalyptic number.

It is an amenable number.

27991180068905 is a deficient number, since it is larger than the sum of its proper divisors (5606324027167).

27991180068905 is a wasteful number, since it uses less digits than its factorization.

27991180068905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348002235.

The product of its (nonzero) digits is 19595520, while the sum is 65.

The spelling of 27991180068905 in words is "twenty-seven trillion, nine hundred ninety-one billion, one hundred eighty million, sixty-eight thousand, nine hundred five".