27866386957 has 2 divisors, whose sum is σ = 27866386958. Its totient is φ = 27866386956.

The previous prime is 27866386939. The next prime is 27866386963. The reversal of 27866386957 is 75968366872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27461129796 + 405257161 = 165714^2 + 20131^2 .

It is a cyclic number.

It is not a de Polignac number, because 27866386957 - 2⁷ = 27866386829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27866386892 and 27866386901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27866386907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13933193478 + 13933193479.

It is an arithmetic number, because the mean of its divisors is an integer number (13933193479).

Almost surely, 2^27866386957 is an apocalyptic number.

It is an amenable number.

27866386957 is a deficient number, since it is larger than the sum of its proper divisors (1).

27866386957 is an equidigital number, since it uses as much as digits as its factorization.

27866386957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 182891520, while the sum is 67.

The spelling of 27866386957 in words is "twenty-seven billion, eight hundred sixty-six million, three hundred eighty-six thousand, nine hundred fifty-seven".