2561995007 has 8 divisors (see below), whose sum is σ = 3009896400. Its totient is φ = 2149925760.

The previous prime is 2561994991. The next prime is 2561995039. The reversal of 2561995007 is 7005991652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2561995007 - 2⁴ = 2561994991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561995057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8957882 + ... + 8958167.

It is an arithmetic number, because the mean of its divisors is an integer number (376237050).

Almost surely, 2^2561995007 is an apocalyptic number.

2561995007 is a deficient number, since it is larger than the sum of its proper divisors (447901393).

2561995007 is a wasteful number, since it uses less digits than its factorization.

2561995007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17916073.

The product of its (nonzero) digits is 170100, while the sum is 44.

The square root of 2561995007 is about 50616.1536172001. The cubic root of 2561995007 is about 1368.3360206951.

The spelling of 2561995007 in words is "two billion, five hundred sixty-one million, nine hundred ninety-five thousand, seven".