166631541225 has 12 divisors (see below), whose sum is σ = 275497481616. Its totient is φ = 88870155280.

The previous prime is 166631541221. The next prime is 166631541229. The reversal of 166631541225 is 522145136661.

It is an interprime number because it is at equal distance from previous prime (166631541221) and next prime (166631541229).

It is not a de Polignac number, because 166631541225 - 2² = 166631541221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166631541221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1110876867 + ... + 1110877016.

It is an arithmetic number, because the mean of its divisors is an integer number (22958123468).

Almost surely, 2^166631541225 is an apocalyptic number.

166631541225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166631541225 is a deficient number, since it is larger than the sum of its proper divisors (108865940391).

166631541225 is a wasteful number, since it uses less digits than its factorization.

166631541225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221753896 (or 2221753891 counting only the distinct ones).

The product of its digits is 259200, while the sum is 42.

Adding to 166631541225 its reverse (522145136661), we get a palindrome (688776677886).

The spelling of 166631541225 in words is "one hundred sixty-six billion, six hundred thirty-one million, five hundred forty-one thousand, two hundred twenty-five".