66575538 has 24 divisors (see below), whose sum is σ = 148901376. Its totient is φ = 21475800.

The previous prime is 66575521. The next prime is 66575549. The reversal of 66575538 is 83557566.

66575538 is a `hidden beast` number, since 66 + 57 + 5 + 538 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 66575493 and 66575502.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59098 + ... + 60213.

It is an arithmetic number, because the mean of its divisors is an integer number (6204224).

Almost surely, 2^66575538 is an apocalyptic number.

66575538 is an abundant number, since it is smaller than the sum of its proper divisors (82325838).

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

66575538 is a wasteful number, since it uses less digits than its factorization.

66575538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119350 (or 119347 counting only the distinct ones).

The product of its digits is 756000, while the sum is 45.

The square root of 66575538 is about 8159.3834325885. The cubic root of 66575538 is about 405.2952944727.

The spelling of 66575538 in words is "sixty-six million, five hundred seventy-five thousand, five hundred thirty-eight".