2681724681 has 12 divisors (see below), whose sum is σ = 3875129908. Its totient is φ = 1787111424.

The previous prime is 2681724677. The next prime is 2681724691. The reversal of 2681724681 is 1864271862.

It can be written as a sum of positive squares in 2 ways, for example, as 1287374400 + 1394350281 = 35880^2 + 37341^2 .

It is not a de Polignac number, because 2681724681 - 2² = 2681724677 is a prime.

It is a super-2 number, since 2×2681724681² = 14383294529369103522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2681724641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34120 + ... + 80793.

Almost surely, 2^2681724681 is an apocalyptic number.

It is an amenable number.

2681724681 is a deficient number, since it is larger than the sum of its proper divisors (1193405227).

2681724681 is a wasteful number, since it uses less digits than its factorization.

2681724681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117512 (or 117509 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 2681724681 is about 51785.3713031006. The cubic root of 2681724681 is about 1389.3278120775.

The spelling of 2681724681 in words is "two billion, six hundred eighty-one million, seven hundred twenty-four thousand, six hundred eighty-one".