613091686181 has 8 divisors (see below), whose sum is σ = 660347315544. Its totient is φ = 565849589760.

The previous prime is 613091686171. The next prime is 613091686219. The reversal of 613091686181 is 181686190316.

It can be written as a sum of positive squares in 4 ways, for example, as 4020701281 + 609070984900 = 63409^2 + 780430^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-613091686181 is a prime.

It is a super-2 number, since 2×613091686181² (a number of 24 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 (613091686171) 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 7 ways as a sum of consecutive naturals, for example, 3289040 + ... + 3470441.

It is an arithmetic number, because the mean of its divisors is an integer number (82543414443).

Almost surely, 2^613091686181 is an apocalyptic number.

It is an amenable number.

613091686181 is a deficient number, since it is larger than the sum of its proper divisors (47255629363).

613091686181 is a wasteful number, since it uses less digits than its factorization.

613091686181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6766471.

The product of its (nonzero) digits is 373248, while the sum is 50.

The spelling of 613091686181 in words is "six hundred thirteen billion, ninety-one million, six hundred eighty-six thousand, one hundred eighty-one".