2206205857 has 2 divisors, whose sum is σ = 2206205858. Its totient is φ = 2206205856.

The previous prime is 2206205831. The next prime is 2206205867. The reversal of 2206205857 is 7585026022.

2206205857 is nontrivially palindromic in base 6.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2190333601 + 15872256 = 46801^2 + 3984^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2206205857 is a prime.

It is a super-2 number, since 2×2206205857² = 9734688566922208898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2206205867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1103102928 + 1103102929.

It is an arithmetic number, because the mean of its divisors is an integer number (1103102929).

Almost surely, 2^2206205857 is an apocalyptic number.

It is an amenable number.

2206205857 is a deficient number, since it is larger than the sum of its proper divisors (1).

2206205857 is an equidigital number, since it uses as much as digits as its factorization.

2206205857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 2206205857 is about 46970.2656688250. The cubic root of 2206205857 is about 1301.8132206585.

The spelling of 2206205857 in words is "two billion, two hundred six million, two hundred five thousand, eight hundred fifty-seven".