166024315540221 has 32 divisors (see below), whose sum is σ = 222290009375616. Its totient is φ = 110221220448000.

The previous prime is 166024315540159. The next prime is 166024315540271. The reversal of 166024315540221 is 122045513420661.

It is not a de Polignac number, because 166024315540221 - 2¹⁴ = 166024315523837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166024315540271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17773715011 + ... + 17773724351.

It is an arithmetic number, because the mean of its divisors is an integer number (6946562792988).

Almost surely, 2^{166024315540221} is an apocalyptic number.

It is an amenable number.

166024315540221 is a deficient number, since it is larger than the sum of its proper divisors (56265693835395).

166024315540221 is a wasteful number, since it uses less digits than its factorization.

166024315540221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19373.

The product of its (nonzero) digits is 345600, while the sum is 42.

Adding to 166024315540221 its reverse (122045513420661), we get a palindrome (288069828960882).

The spelling of 166024315540221 in words is "one hundred sixty-six trillion, twenty-four billion, three hundred fifteen million, five hundred forty thousand, two hundred twenty-one".