2561694142 has 16 divisors (see below), whose sum is σ = 4396021632. Its totient is φ = 1096732440.

The previous prime is 2561694139. The next prime is 2561694143. The reversal of 2561694142 is 2414961652.

2561694142 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 2561694095 and 2561694104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561694143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80628 + ... + 107815.

It is an arithmetic number, because the mean of its divisors is an integer number (274751352).

Almost surely, 2^2561694142 is an apocalyptic number.

2561694142 is a deficient number, since it is larger than the sum of its proper divisors (1834327490).

2561694142 is a wasteful number, since it uses less digits than its factorization.

2561694142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189423.

The product of its digits is 103680, while the sum is 40.

The square root of 2561694142 is about 50613.1815044263. The cubic root of 2561694142 is about 1368.2824555981.

The spelling of 2561694142 in words is "two billion, five hundred sixty-one million, six hundred ninety-four thousand, one hundred forty-two".