2605554521 has 16 divisors (see below), whose sum is σ = 2801755008. Its totient is φ = 2414227200.

The previous prime is 2605554481. The next prime is 2605554593. The reversal of 2605554521 is 1254555062.

It is not a de Polignac number, because 2605554521 - 2¹⁴ = 2605538137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2605553521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1221626 + ... + 1223756.

It is an arithmetic number, because the mean of its divisors is an integer number (175109688).

Almost surely, 2^2605554521 is an apocalyptic number.

It is an amenable number.

2605554521 is a deficient number, since it is larger than the sum of its proper divisors (196200487).

2605554521 is a wasteful number, since it uses less digits than its factorization.

2605554521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3232.

The product of its (nonzero) digits is 60000, while the sum is 35.

The square root of 2605554521 is about 51044.6326365466. The cubic root of 2605554521 is about 1376.0473819837.

The spelling of 2605554521 in words is "two billion, six hundred five million, five hundred fifty-four thousand, five hundred twenty-one".