2561923977242 has 32 divisors (see below), whose sum is σ = 4685712831360. Its totient is φ = 1025492682240.

The previous prime is 2561923977187. The next prime is 2561923977247. The reversal of 2561923977242 is 2427793291652.

It is not an unprimeable number, because it can be changed into a prime (2561923977247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41054267 + ... + 41116622.

It is an arithmetic number, because the mean of its divisors is an integer number (146428525980).

Almost surely, 2^{2561923977242} is an apocalyptic number.

2561923977242 is a deficient number, since it is larger than the sum of its proper divisors (2123788854118).

2561923977242 is a wasteful number, since it uses less digits than its factorization.

2561923977242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82171046.

The product of its digits is 22861440, while the sum is 59.

The spelling of 2561923977242 in words is "two trillion, five hundred sixty-one billion, nine hundred twenty-three million, nine hundred seventy-seven thousand, two hundred forty-two".