2561719338 has 16 divisors (see below), whose sum is σ = 5692709760. Its totient is φ = 853906428.

The previous prime is 2561719337. The next prime is 2561719351. The reversal of 2561719338 is 8339171652.

2561719338 is a `hidden beast` number, since 25 + 617 + 1 + 9 + 3 + 3 + 8 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2561719293 and 2561719302.

It is not an unprimeable number, because it can be changed into a prime (2561719337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23719570 + ... + 23719677.

It is an arithmetic number, because the mean of its divisors is an integer number (355794360).

Almost surely, 2^2561719338 is an apocalyptic number.

2561719338 is an abundant number, since it is smaller than the sum of its proper divisors (3130990422).

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

2561719338 is a wasteful number, since it uses less digits than its factorization.

2561719338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47439258 (or 47439252 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 2561719338 is about 50613.4304113049. The cubic root of 2561719338 is about 1368.2869415788.

The spelling of 2561719338 in words is "two billion, five hundred sixty-one million, seven hundred nineteen thousand, three hundred thirty-eight".