2197843708657 has 2 divisors, whose sum is σ = 2197843708658. Its totient is φ = 2197843708656.

The previous prime is 2197843708531. The next prime is 2197843708759. The reversal of 2197843708657 is 7568073487912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2010358172641 + 187485536016 = 1417871^2 + 432996^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2197843708657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2197843708592 and 2197843708601.

It is not a weakly prime, because it can be changed into another prime (2197843708457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1098921854328 + 1098921854329.

It is an arithmetic number, because the mean of its divisors is an integer number (1098921854329).

It is a 1-persistent number, because it is pandigital, but 2⋅2197843708657 = 4395687417314 is not.

Almost surely, 2^{2197843708657} is an apocalyptic number.

It is an amenable number.

2197843708657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2197843708657 is an equidigital number, since it uses as much as digits as its factorization.

2197843708657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142248960, while the sum is 67.

The spelling of 2197843708657 in words is "two trillion, one hundred ninety-seven billion, eight hundred forty-three million, seven hundred eight thousand, six hundred fifty-seven".