2561908942 has 16 divisors (see below), whose sum is σ = 4069895760. Its totient is φ = 1205313408.

The previous prime is 2561908919. The next prime is 2561908969. The reversal of 2561908942 is 2498091652.

It is a junction number, because it is equal to n+sod(n) for n = 2561908892 and 2561908901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211609 + ... + 223387.

It is an arithmetic number, because the mean of its divisors is an integer number (254368485).

Almost surely, 2^2561908942 is an apocalyptic number.

2561908942 is a deficient number, since it is larger than the sum of its proper divisors (1507986818).

2561908942 is a wasteful number, since it uses less digits than its factorization.

2561908942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18195.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 2561908942 is about 50615.3034368065. The cubic root of 2561908942 is about 1368.3206983704.

The spelling of 2561908942 in words is "two billion, five hundred sixty-one million, nine hundred eight thousand, nine hundred forty-two".