66575716 has 6 divisors (see below), whose sum is σ = 116507510. Its totient is φ = 33287856.

The previous prime is 66575687. The next prime is 66575737. The reversal of 66575716 is 61757566.

It can be written as a sum of positive squares in only one way, i.e., 39639616 + 26936100 = 6296^2 + 5190^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8321961 + ... + 8321968.

Almost surely, 2^66575716 is an apocalyptic number.

It is an amenable number.

66575716 is a deficient number, since it is larger than the sum of its proper divisors (49931794).

66575716 is a wasteful number, since it uses less digits than its factorization.

66575716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16643933 (or 16643931 counting only the distinct ones).

The product of its digits is 264600, while the sum is 43.

The square root of 66575716 is about 8159.3943402682. The cubic root of 66575716 is about 405.2956556790.

The spelling of 66575716 in words is "sixty-six million, five hundred seventy-five thousand, seven hundred sixteen".