166553130440225 has 24 divisors (see below), whose sum is σ = 206703240526848. Its totient is φ = 133128112752000.

The previous prime is 166553130440209. The next prime is 166553130440287. The reversal of 166553130440225 is 522044031355661.

It is not a de Polignac number, because 166553130440225 - 2⁴ = 166553130440209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166553130440225.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 200590925 + ... + 201419525.

It is an arithmetic number, because the mean of its divisors is an integer number (8612635021952).

Almost surely, 2^{166553130440225} is an apocalyptic number.

It is an amenable number.

166553130440225 is a deficient number, since it is larger than the sum of its proper divisors (40150110086623).

166553130440225 is a wasteful number, since it uses less digits than its factorization.

166553130440225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835505 (or 835500 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 47.

Adding to 166553130440225 its reverse (522044031355661), we get a palindrome (688597161795886).

The spelling of 166553130440225 in words is "one hundred sixty-six trillion, five hundred fifty-three billion, one hundred thirty million, four hundred forty thousand, two hundred twenty-five".