2659312681 has 4 divisors (see below), whose sum is σ = 2661820164. Its totient is φ = 2656805200.

The previous prime is 2659312661. The next prime is 2659312697. The reversal of 2659312681 is 1862139562.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1862139562 = 2 ⋅931069781.

It can be written as a sum of positive squares in 2 ways, for example, as 1006158400 + 1653154281 = 31720^2 + 40659^2 .

It is a cyclic number.

It is not a de Polignac number, because 2659312681 - 2⁷ = 2659312553 is a prime.

It is a super-2 number, since 2×2659312681² = 14143887870654815522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2659312631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1252150 + ... + 1254271.

It is an arithmetic number, because the mean of its divisors is an integer number (665455041).

Almost surely, 2^2659312681 is an apocalyptic number.

It is an amenable number.

2659312681 is a deficient number, since it is larger than the sum of its proper divisors (2507483).

2659312681 is a wasteful number, since it uses less digits than its factorization.

2659312681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2507482.

The product of its digits is 155520, while the sum is 43.

The square root of 2659312681 is about 51568.5241305198. The cubic root of 2659312681 is about 1385.4466328798.

The spelling of 2659312681 in words is "two billion, six hundred fifty-nine million, three hundred twelve thousand, six hundred eighty-one".