181354868453181 has 4 divisors (see below), whose sum is σ = 241806491270912. Its totient is φ = 120903245635452.

The previous prime is 181354868453141. The next prime is 181354868453243.

181354868453181 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 181354868453181 - 2⁶ = 181354868453117 is a prime.

It is a super-2 number, since 2×181354868453181² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181354868453131) 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, 30225811408861 + ... + 30225811408866.

It is an arithmetic number, because the mean of its divisors is an integer number (60451622817728).

Almost surely, 2^{181354868453181} is an apocalyptic number.

It is an amenable number.

181354868453181 is a deficient number, since it is larger than the sum of its proper divisors (60451622817731).

181354868453181 is an equidigital number, since it uses as much as digits as its factorization.

181354868453181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60451622817730.

The product of its digits is 88473600, while the sum is 66.

The spelling of 181354868453181 in words is "one hundred eighty-one trillion, three hundred fifty-four billion, eight hundred sixty-eight million, four hundred fifty-three thousand, one hundred eighty-one".