2685520645 has 8 divisors (see below), whose sum is σ = 3226012056. Its totient is φ = 2146158336.

The previous prime is 2685520637. The next prime is 2685520679. The reversal of 2685520645 is 5460255862.

It can be written as a sum of positive squares in 4 ways, for example, as 961 + 2685519684 = 31^2 + 51822^2 .

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 2685520645 - 2³ = 2685520637 is a prime.

It is a super-2 number, since 2×2685520645² = 14424042269442432050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277032 + ... + 286561.

It is an arithmetic number, because the mean of its divisors is an integer number (403251507).

Almost surely, 2^2685520645 is an apocalyptic number.

It is an amenable number.

2685520645 is a deficient number, since it is larger than the sum of its proper divisors (540491411).

2685520645 is an equidigital number, since it uses as much as digits as its factorization.

2685520645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564551.

The product of its (nonzero) digits is 576000, while the sum is 43.

The square root of 2685520645 is about 51822.0092721230. The cubic root of 2685520645 is about 1389.9830312094.

The spelling of 2685520645 in words is "two billion, six hundred eighty-five million, five hundred twenty thousand, six hundred forty-five".