2561428885 has 8 divisors (see below), whose sum is σ = 3076645536. Its totient is φ = 2047189200.

The previous prime is 2561428871. The next prime is 2561428901. The reversal of 2561428885 is 5888241652.

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

It is a de Polignac number, because none of the positive numbers 2^k-2561428885 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238459 + ... + 248968.

It is an arithmetic number, because the mean of its divisors is an integer number (384580692).

Almost surely, 2^2561428885 is an apocalyptic number.

It is an amenable number.

2561428885 is a deficient number, since it is larger than the sum of its proper divisors (515216651).

2561428885 is a wasteful number, since it uses less digits than its factorization.

2561428885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488483.

The product of its digits is 1228800, while the sum is 49.

The square root of 2561428885 is about 50610.5610026208. The cubic root of 2561428885 is about 1368.2352265630.

The spelling of 2561428885 in words is "two billion, five hundred sixty-one million, four hundred twenty-eight thousand, eight hundred eighty-five".