2080685521 has 4 divisors (see below), whose sum is σ = 2104064100. Its totient is φ = 2057306944.

The previous prime is 2080685479. The next prime is 2080685543. The reversal of 2080685521 is 1255860802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 760380625 + 1320304896 = 27575^2 + 36336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2080685521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2080685561) 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, 11689156 + ... + 11689333.

It is an arithmetic number, because the mean of its divisors is an integer number (526016025).

Almost surely, 2^2080685521 is an apocalyptic number.

It is an amenable number.

2080685521 is a deficient number, since it is larger than the sum of its proper divisors (23378579).

2080685521 is an equidigital number, since it uses as much as digits as its factorization.

2080685521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23378578.

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 2080685521 is about 45614.5319059617. The cubic root of 2080685521 is about 1276.6410796485.

The spelling of 2080685521 in words is "two billion, eighty million, six hundred eighty-five thousand, five hundred twenty-one".