2555656521 has 8 divisors (see below), whose sum is σ = 3717318624. Its totient is φ = 1548882720.

The previous prime is 2555656517. The next prime is 2555656531. The reversal of 2555656521 is 1256565552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2555656521 - 2² = 2555656517 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2555656501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38722036 + ... + 38722101.

It is an arithmetic number, because the mean of its divisors is an integer number (464664828).

Almost surely, 2^2555656521 is an apocalyptic number.

It is an amenable number.

2555656521 is a deficient number, since it is larger than the sum of its proper divisors (1161662103).

2555656521 is a wasteful number, since it uses less digits than its factorization.

2555656521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77444151.

The product of its digits is 450000, while the sum is 42.

The square root of 2555656521 is about 50553.5015701188. The cubic root of 2555656521 is about 1367.2066480590.

The spelling of 2555656521 in words is "two billion, five hundred fifty-five million, six hundred fifty-six thousand, five hundred twenty-one".