27938143757977 has 2 divisors, whose sum is σ = 27938143757978. Its totient is φ = 27938143757976.

The previous prime is 27938143757971. The next prime is 27938143758073. The reversal of 27938143757977 is 77975734183972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26258050796121 + 1680092961856 = 5124261^2 + 1296184^2 .

It is a cyclic number.

It is not a de Polignac number, because 27938143757977 - 2²³ = 27938135369369 is a prime.

It is a super-2 number, since 2×27938143757977² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 27938143757897 and 27938143757906.

It is not a weakly prime, because it can be changed into another prime (27938143757971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13969071878988 + 13969071878989.

It is an arithmetic number, because the mean of its divisors is an integer number (13969071878989).

Almost surely, 2^{27938143757977} is an apocalyptic number.

It is an amenable number.

27938143757977 is a deficient number, since it is larger than the sum of its proper divisors (1).

27938143757977 is an equidigital number, since it uses as much as digits as its factorization.

27938143757977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3920736960, while the sum is 79.

The spelling of 27938143757977 in words is "twenty-seven trillion, nine hundred thirty-eight billion, one hundred forty-three million, seven hundred fifty-seven thousand, nine hundred seventy-seven".