2561358011606 has 4 divisors (see below), whose sum is σ = 3842037017412. Its totient is φ = 1280679005802.

The previous prime is 2561358011447. The next prime is 2561358011629. The reversal of 2561358011606 is 6061108531652.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640339502900 + ... + 640339502903.

It is an arithmetic number, because the mean of its divisors is an integer number (960509254353).

Almost surely, 2^{2561358011606} is an apocalyptic number.

2561358011606 is a deficient number, since it is larger than the sum of its proper divisors (1280679005806).

2561358011606 is a wasteful number, since it uses less digits than its factorization.

2561358011606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280679005805.

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 2561358011606 in words is "two trillion, five hundred sixty-one billion, three hundred fifty-eight million, eleven thousand, six hundred six".