25605645513 has 16 divisors (see below), whose sum is σ = 39040853376. Its totient is φ = 14623274880.

The previous prime is 25605645509. The next prime is 25605645539. The reversal of 25605645513 is 31554650652.

It is not a de Polignac number, because 25605645513 - 2² = 25605645509 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25605645113) 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 15 ways as a sum of consecutive naturals, for example, 318106 + ... + 390387.

It is an arithmetic number, because the mean of its divisors is an integer number (2440053336).

Almost surely, 2^25605645513 is an apocalyptic number.

It is an amenable number.

25605645513 is a deficient number, since it is larger than the sum of its proper divisors (13435207863).

25605645513 is a wasteful number, since it uses less digits than its factorization.

25605645513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710224.

The product of its (nonzero) digits is 540000, while the sum is 42.

The spelling of 25605645513 in words is "twenty-five billion, six hundred five million, six hundred forty-five thousand, five hundred thirteen".