66652025666 has 16 divisors (see below), whose sum is σ = 100906812600. Its totient is φ = 33016491648.

The previous prime is 66652025653. The next prime is 66652025689.

66652025666 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 59533560025 + 7118465641 = 243995^2 + 84371^2 .

It is a super-2 number, since 2×66652025666² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3708590 + ... + 3726518.

Almost surely, 2^66652025666 is an apocalyptic number.

66652025666 is a deficient number, since it is larger than the sum of its proper divisors (34254786934).

66652025666 is a wasteful number, since it uses less digits than its factorization.

66652025666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35093.

The product of its (nonzero) digits is 4665600, while the sum is 50.

The spelling of 66652025666 in words is "sixty-six billion, six hundred fifty-two million, twenty-five thousand, six hundred sixty-six".