27919342861 has 2 divisors, whose sum is σ = 27919342862. Its totient is φ = 27919342860.

The previous prime is 27919342831. The next prime is 27919342883. The reversal of 27919342861 is 16824391972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25152056836 + 2767286025 = 158594^2 + 52605^2 .

It is a cyclic number.

It is not a de Polignac number, because 27919342861 - 2⁷ = 27919342733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27919342799 and 27919342808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27919342831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13959671430 + 13959671431.

It is an arithmetic number, because the mean of its divisors is an integer number (13959671431).

Almost surely, 2^27919342861 is an apocalyptic number.

It is an amenable number.

27919342861 is a deficient number, since it is larger than the sum of its proper divisors (1).

27919342861 is an equidigital number, since it uses as much as digits as its factorization.

27919342861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 52.

The spelling of 27919342861 in words is "twenty-seven billion, nine hundred nineteen million, three hundred forty-two thousand, eight hundred sixty-one".