2165420057 has 2 divisors, whose sum is σ = 2165420058. Its totient is φ = 2165420056.

The previous prime is 2165420021. The next prime is 2165420071. The reversal of 2165420057 is 7500245612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1711559641 + 453860416 = 41371^2 + 21304^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165420057 - 2¹⁴ = 2165403673 is a prime.

It is not a weakly prime, because it can be changed into another prime (2165420087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082710028 + 1082710029.

It is an arithmetic number, because the mean of its divisors is an integer number (1082710029).

Almost surely, 2^2165420057 is an apocalyptic number.

It is an amenable number.

2165420057 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165420057 is an equidigital number, since it uses as much as digits as its factorization.

2165420057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 2165420057 is about 46534.0741500247. The cubic root of 2165420057 is about 1293.7411293253.

Adding to 2165420057 its reverse (7500245612), we get a palindrome (9665665669).

The spelling of 2165420057 in words is "two billion, one hundred sixty-five million, four hundred twenty thousand, fifty-seven".