166531335747771 has 16 divisors (see below), whose sum is σ = 225224038991520. Its totient is φ = 109431661363200.

The previous prime is 166531335747703. The next prime is 166531335747883. The reversal of 166531335747771 is 177747533135661.

It is not a de Polignac number, because 166531335747771 - 2¹⁰ = 166531335746747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166531335745771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237131286 + ... + 237832523.

It is an arithmetic number, because the mean of its divisors is an integer number (14076502436970).

Almost surely, 2^{166531335747771} is an apocalyptic number.

166531335747771 is a deficient number, since it is larger than the sum of its proper divisors (58692703243749).

166531335747771 is a wasteful number, since it uses less digits than its factorization.

166531335747771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474965486.

The product of its digits is 233377200, while the sum is 66.

The spelling of 166531335747771 in words is "one hundred sixty-six trillion, five hundred thirty-one billion, three hundred thirty-five million, seven hundred forty-seven thousand, seven hundred seventy-one".