3681368857 has 4 divisors (see below), whose sum is σ = 3681490356. Its totient is φ = 3681247360.

The previous prime is 3681368851. The next prime is 3681368861. The reversal of 3681368857 is 7588631863.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7588631863 = 19 ⋅399401677.

It can be written as a sum of positive squares in 2 ways, for example, as 1504586521 + 2176782336 = 38789^2 + 46656^2 .

It is a cyclic number.

It is not a de Polignac number, because 3681368857 - 2²⁷ = 3547151129 is a prime.

It is a super-2 number, since 2×3681368857² = 27104953322578972898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3681368798 and 3681368807.

It is not an unprimeable number, because it can be changed into a prime (3681368851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25857 + ... + 89617.

It is an arithmetic number, because the mean of its divisors is an integer number (920372589).

Almost surely, 2^3681368857 is an apocalyptic number.

It is an amenable number.

3681368857 is a deficient number, since it is larger than the sum of its proper divisors (121499).

3681368857 is an equidigital number, since it uses as much as digits as its factorization.

3681368857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121498.

The product of its digits is 5806080, while the sum is 55.

The square root of 3681368857 is about 60674.2849731251. The cubic root of 3681368857 is about 1544.0799299151.

The spelling of 3681368857 in words is "three billion, six hundred eighty-one million, three hundred sixty-eight thousand, eight hundred fifty-seven".