181262627951161 has 9 divisors (see below), whose sum is σ = 191305148783781. Its totient is φ = 171722247297084.

The previous prime is 181262627951143. The next prime is 181262627951189. The reversal of 181262627951161 is 161159726262181.

The square root of 181262627951161 is 13463381.

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

It is a de Polignac number, because none of the positive numbers 2^k-181262627951161 is a prime.

It is a super-2 number, since 2×181262627951161² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 181262627951096 and 181262627951105.

It is not an unprimeable number, because it can be changed into a prime (181262627951131) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 255449940 + ... + 256158538.

Almost surely, 2^{181262627951161} is an apocalyptic number.

181262627951161 is the 13463381-st square number.

181262627951161 is the 6731691-st centered octagonal number.

It is an amenable number.

181262627951161 is a deficient number, since it is larger than the sum of its proper divisors (10042520832620).

181262627951161 is an frugal number, since it uses more digits than its factorization.

181262627951161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1417236 (or 708618 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 58.

The spelling of 181262627951161 in words is "one hundred eighty-one trillion, two hundred sixty-two billion, six hundred twenty-seven million, nine hundred fifty-one thousand, one hundred sixty-one".