166877851141 has 4 divisors (see below), whose sum is σ = 171388063372. Its totient is φ = 162367638912.

The previous prime is 166877851087. The next prime is 166877851163. The reversal of 166877851141 is 141158778661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 141158778661 = 211 ⋅668998951.

It can be written as a sum of positive squares in 2 ways, for example, as 72288388225 + 94589462916 = 268865^2 + 307554^2 .

It is a cyclic number.

It is not a de Polignac number, because 166877851141 - 2¹⁹ = 166877326853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166877855141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2255106060 + ... + 2255106133.

It is an arithmetic number, because the mean of its divisors is an integer number (42847015843).

Almost surely, 2^166877851141 is an apocalyptic number.

It is an amenable number.

166877851141 is a deficient number, since it is larger than the sum of its proper divisors (4510212231).

166877851141 is an equidigital number, since it uses as much as digits as its factorization.

166877851141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4510212230.

The product of its digits is 2257920, while the sum is 55.

The spelling of 166877851141 in words is "one hundred sixty-six billion, eight hundred seventy-seven million, eight hundred fifty-one thousand, one hundred forty-one".