8181701362261 has 6 divisors (see below), whose sum is σ = 9517489339830. Its totient is φ = 7012886881896.

The previous prime is 8181701362253. The next prime is 8181701362319. The reversal of 8181701362261 is 1622631071818.

It can be written as a sum of positive squares in only one way, i.e., 5350662922500 + 2831038439761 = 2313150^2 + 1682569^2 .

It is not a de Polignac number, because 8181701362261 - 2³ = 8181701362253 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 (8181701362231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 83486748546 + ... + 83486748643.

It is an arithmetic number, because the mean of its divisors is an integer number (1586248223305).

Almost surely, 2^{8181701362261} is an apocalyptic number.

It is an amenable number.

8181701362261 is a deficient number, since it is larger than the sum of its proper divisors (1335787977569).

8181701362261 is a wasteful number, since it uses less digits than its factorization.

8181701362261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166973497203 (or 166973497196 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 46.

The spelling of 8181701362261 in words is "eight trillion, one hundred eighty-one billion, seven hundred one million, three hundred sixty-two thousand, two hundred sixty-one".