2158818647 has 2 divisors, whose sum is σ = 2158818648. Its totient is φ = 2158818646.

The previous prime is 2158818643. The next prime is 2158818671. The reversal of 2158818647 is 7468188512.

2158818647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2158818647 - 2² = 2158818643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2158818595 and 2158818604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2158818643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079409323 + 1079409324.

It is an arithmetic number, because the mean of its divisors is an integer number (1079409324).

Almost surely, 2^2158818647 is an apocalyptic number.

2158818647 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158818647 is an equidigital number, since it uses as much as digits as its factorization.

2158818647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 860160, while the sum is 50.

The square root of 2158818647 is about 46463.0890815495. The cubic root of 2158818647 is about 1292.4251092020.

The spelling of 2158818647 in words is "two billion, one hundred fifty-eight million, eight hundred eighteen thousand, six hundred forty-seven".