2685678581 has 8 divisors (see below), whose sum is σ = 2861775000. Its totient is φ = 2511595008.

The previous prime is 2685678539. The next prime is 2685678599. The reversal of 2685678581 is 1858765862.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 349503025 + 2336175556 = 18695^2 + 48334^2 .

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 2685678581 - 2²² = 2681484277 is a prime.

It is a super-2 number, since 2×2685678581² = 14425738880884347122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2685674581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500456 + ... + 505793.

It is an arithmetic number, because the mean of its divisors is an integer number (357721875).

Almost surely, 2^2685678581 is an apocalyptic number.

It is an amenable number.

2685678581 is a deficient number, since it is larger than the sum of its proper divisors (176096419).

2685678581 is a wasteful number, since it uses less digits than its factorization.

2685678581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006423.

The product of its digits is 6451200, while the sum is 56.

The square root of 2685678581 is about 51823.5330810241. The cubic root of 2685678581 is about 1390.0102790676.

The spelling of 2685678581 in words is "two billion, six hundred eighty-five million, six hundred seventy-eight thousand, five hundred eighty-one".