166127977744 has 135 divisors (see below), whose sum is σ = 353057707269. Its totient is φ = 75713546880.

The previous prime is 166127977727. The next prime is 166127977759. The reversal of 166127977744 is 447779721661.

The square root of 166127977744 is 407588.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 151118787600 + 15009190144 = 388740^2 + 122512^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 960277242 + ... + 960277414.

Almost surely, 2^166127977744 is an apocalyptic number.

166127977744 is the 407588-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166127977744

166127977744 is an abundant number, since it is smaller than the sum of its proper divisors (186929729525).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166127977744 is an equidigital number, since it uses as much as digits as its factorization.

166127977744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454 (or 225 counting only the distinct ones).

The product of its digits is 24893568, while the sum is 61.

The spelling of 166127977744 in words is "one hundred sixty-six billion, one hundred twenty-seven million, nine hundred seventy-seven thousand, seven hundred forty-four".