538857666 has 24 divisors (see below), whose sum is σ = 1168209900. Its totient is φ = 179513856.

The previous prime is 538857647. The next prime is 538857667. The reversal of 538857666 is 666758835.

It can be written as a sum of positive squares in 2 ways, for example, as 538472025 + 385641 = 23205^2 + 621^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (538857667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26610 + ... + 42258.

Almost surely, 2^538857666 is an apocalyptic number.

538857666 is an abundant number, since it is smaller than the sum of its proper divisors (629352234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

538857666 is a wasteful number, since it uses less digits than its factorization.

538857666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17570 (or 17567 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The square root of 538857666 is about 23213.3079503978. The cubic root of 538857666 is about 813.7506626454.

The spelling of 538857666 in words is "five hundred thirty-eight million, eight hundred fifty-seven thousand, six hundred sixty-six".