2561163235254 has 64 divisors (see below), whose sum is σ = 6173375308800. Its totient is φ = 782380770336.

The previous prime is 2561163235243. The next prime is 2561163235273. The reversal of 2561163235254 is 4525323611652.

2561163235254 is a `hidden beast` number, since 2 + 5 + 6 + 1 + 1 + 632 + 3 + 5 + 2 + 5 + 4 = 666.

2561163235254 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2561163235254² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13026094 + ... + 13221249.

It is an arithmetic number, because the mean of its divisors is an integer number (96458989200).

Almost surely, 2^{2561163235254} is an apocalyptic number.

2561163235254 is an abundant number, since it is smaller than the sum of its proper divisors (3612212073546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2561163235254 is a wasteful number, since it uses less digits than its factorization.

2561163235254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26247506 (or 26247500 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 45.

The spelling of 2561163235254 in words is "two trillion, five hundred sixty-one billion, one hundred sixty-three million, two hundred thirty-five thousand, two hundred fifty-four".