2158469657 has 2 divisors, whose sum is σ = 2158469658. Its totient is φ = 2158469656.

The previous prime is 2158469611. The next prime is 2158469669. The reversal of 2158469657 is 7569648512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2158438681 + 30976 = 46459^2 + 176^2 .

It is a cyclic number.

It is not a de Polignac number, because 2158469657 - 2¹⁰ = 2158468633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2158469599 and 2158469608.

It is not a weakly prime, because it can be changed into another prime (2158469857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079234828 + 1079234829.

It is an arithmetic number, because the mean of its divisors is an integer number (1079234829).

Almost surely, 2^2158469657 is an apocalyptic number.

It is an amenable number.

2158469657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158469657 is an equidigital number, since it uses as much as digits as its factorization.

2158469657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3628800, while the sum is 53.

The square root of 2158469657 is about 46459.3333680112. Note that the first 4 decimals coincide. The cubic root of 2158469657 is about 1292.3554618902.

The spelling of 2158469657 in words is "two billion, one hundred fifty-eight million, four hundred sixty-nine thousand, six hundred fifty-seven".