2561737198 has 8 divisors (see below), whose sum is σ = 3843591192. Its totient is φ = 1280540136.

The previous prime is 2561737181. The next prime is 2561737201. The reversal of 2561737198 is 8917371652.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154365 + ... + 170152.

It is an arithmetic number, because the mean of its divisors is an integer number (480448899).

Almost surely, 2^2561737198 is an apocalyptic number.

2561737198 is a deficient number, since it is larger than the sum of its proper divisors (1281853994).

2561737198 is a wasteful number, since it uses less digits than its factorization.

2561737198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328466.

The product of its digits is 635040, while the sum is 49.

The square root of 2561737198 is about 50613.6068463807. The cubic root of 2561737198 is about 1368.2901214156.

The spelling of 2561737198 in words is "two billion, five hundred sixty-one million, seven hundred thirty-seven thousand, one hundred ninety-eight".