27933978977 has 2 divisors, whose sum is σ = 27933978978. Its totient is φ = 27933978976.

The previous prime is 27933978973. The next prime is 27933979043. The reversal of 27933978977 is 77987933972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27875975521 + 58003456 = 166961^2 + 7616^2 .

It is a cyclic number.

It is not a de Polignac number, because 27933978977 - 2² = 27933978973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27933978977.

It is not a weakly prime, because it can be changed into another prime (27933978973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13966989488 + 13966989489.

It is an arithmetic number, because the mean of its divisors is an integer number (13966989489).

Almost surely, 2^27933978977 is an apocalyptic number.

It is an amenable number.

27933978977 is a deficient number, since it is larger than the sum of its proper divisors (1).

27933978977 is an equidigital number, since it uses as much as digits as its factorization.

27933978977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252047376, while the sum is 71.

The spelling of 27933978977 in words is "twenty-seven billion, nine hundred thirty-three million, nine hundred seventy-eight thousand, nine hundred seventy-seven".