538665769 has 2 divisors, whose sum is σ = 538665770. Its totient is φ = 538665768.

The previous prime is 538665763. The next prime is 538665821. The reversal of 538665769 is 967566835.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 458473744 + 80192025 = 21412^2 + 8955^2 .

It is a cyclic number.

It is not a de Polignac number, because 538665769 - 2¹³ = 538657577 is a prime.

It is a super-2 number, since 2×538665769² = 580321621384722722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (538665763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269332884 + 269332885.

It is an arithmetic number, because the mean of its divisors is an integer number (269332885).

Almost surely, 2^538665769 is an apocalyptic number.

It is an amenable number.

538665769 is a deficient number, since it is larger than the sum of its proper divisors (1).

538665769 is an equidigital number, since it uses as much as digits as its factorization.

538665769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8164800, while the sum is 55.

The square root of 538665769 is about 23209.1742420966. The cubic root of 538665769 is about 813.6540540471.

The spelling of 538665769 in words is "five hundred thirty-eight million, six hundred sixty-five thousand, seven hundred sixty-nine".