2561008694 has 8 divisors (see below), whose sum is σ = 3850185960. Its totient is φ = 1277613376.

The previous prime is 2561008679. The next prime is 2561008739. The reversal of 2561008694 is 4968001652.

It is a happy number.

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

It is a Curzon number.

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, 1444379 + ... + 1446150.

It is an arithmetic number, because the mean of its divisors is an integer number (481273245).

Almost surely, 2^2561008694 is an apocalyptic number.

2561008694 is a deficient number, since it is larger than the sum of its proper divisors (1289177266).

2561008694 is a wasteful number, since it uses less digits than its factorization.

2561008694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2890974.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 2561008694 is about 50606.4096138029. The cubic root of 2561008694 is about 1368.1604048399.

The spelling of 2561008694 in words is "two billion, five hundred sixty-one million, eight thousand, six hundred ninety-four".