2561798535 has 16 divisors (see below), whose sum is σ = 4277090304. Its totient is φ = 1306888352.

The previous prime is 2561798507. The next prime is 2561798579. The reversal of 2561798535 is 5358971652.

It is a happy number.

2561798535 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2561798535 - 2¹² = 2561794439 is a prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3712407 + ... + 3713096.

It is an arithmetic number, because the mean of its divisors is an integer number (267318144).

Almost surely, 2^2561798535 is an apocalyptic number.

2561798535 is a deficient number, since it is larger than the sum of its proper divisors (1715291769).

2561798535 is a wasteful number, since it uses less digits than its factorization.

2561798535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7425534.

The product of its digits is 2268000, while the sum is 51.

The square root of 2561798535 is about 50614.2127766500. The cubic root of 2561798535 is about 1368.3010418880.

The spelling of 2561798535 in words is "two billion, five hundred sixty-one million, seven hundred ninety-eight thousand, five hundred thirty-five".