2561797594 has 8 divisors (see below), whose sum is σ = 3853771488. Its totient is φ = 1277207100.

The previous prime is 2561797591. The next prime is 2561797613. The reversal of 2561797594 is 4957971652.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (2561797591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1844982 + ... + 1846369.

It is an arithmetic number, because the mean of its divisors is an integer number (481721436).

Almost surely, 2^2561797594 is an apocalyptic number.

2561797594 is a deficient number, since it is larger than the sum of its proper divisors (1291973894).

2561797594 is a wasteful number, since it uses less digits than its factorization.

2561797594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3691700.

The product of its digits is 4762800, while the sum is 55.

The square root of 2561797594 is about 50614.2034808412. The cubic root of 2561797594 is about 1368.3008743532.

The spelling of 2561797594 in words is "two billion, five hundred sixty-one million, seven hundred ninety-seven thousand, five hundred ninety-four".