2553166521 has 16 divisors (see below), whose sum is σ = 3838926400. Its totient is φ = 1676705184.

The previous prime is 2553166513. The next prime is 2553166579. The reversal of 2553166521 is 1256613552.

2553166521 is a `hidden beast` number, since 25 + 53 + 1 + 66 + 521 = 666.

2553166521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2553166521 - 2³ = 2553166513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2553166921) 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, 703876 + ... + 707493.

It is an arithmetic number, because the mean of its divisors is an integer number (239932900).

Almost surely, 2^2553166521 is an apocalyptic number.

It is an amenable number.

2553166521 is a deficient number, since it is larger than the sum of its proper divisors (1285759879).

2553166521 is a wasteful number, since it uses less digits than its factorization.

2553166521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411445 (or 1411439 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 2553166521 is about 50528.8681943303. The cubic root of 2553166521 is about 1366.7624763752.

The spelling of 2553166521 in words is "two billion, five hundred fifty-three million, one hundred sixty-six thousand, five hundred twenty-one".