681194165 has 8 divisors (see below), whose sum is σ = 865517400. Its totient is φ = 512899072.

The previous prime is 681194153. The next prime is 681194201. The reversal of 681194165 is 561491186.

681194165 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 225030001 + 456164164 = 15001^2 + 21358^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 681194165 - 2⁴ = 681194149 is a prime.

It is a super-3 number, since 3×681194165³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4006940 + ... + 4007109.

It is an arithmetic number, because the mean of its divisors is an integer number (108189675).

Almost surely, 2^681194165 is an apocalyptic number.

It is an amenable number.

681194165 is a deficient number, since it is larger than the sum of its proper divisors (184323235).

681194165 is a wasteful number, since it uses less digits than its factorization.

681194165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8014071.

The product of its digits is 51840, while the sum is 41.

The square root of 681194165 is about 26099.6966457467. The cubic root of 681194165 is about 879.8803922322.

The spelling of 681194165 in words is "six hundred eighty-one million, one hundred ninety-four thousand, one hundred sixty-five".