25445136321 has 48 divisors (see below), whose sum is σ = 41497380288. Its totient is φ = 14889830400.

The previous prime is 25445136289. The next prime is 25445136329. The reversal of 25445136321 is 12363154452.

25445136321 is a `hidden beast` number, since 2 + 5 + 4 + 4 + 5 + 13 + 632 + 1 = 666.

It is not a de Polignac number, because 25445136321 - 2⁵ = 25445136289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25445136329) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 361410 + ... + 426036.

It is an arithmetic number, because the mean of its divisors is an integer number (864528756).

Almost surely, 2^25445136321 is an apocalyptic number.

It is an amenable number.

25445136321 is a deficient number, since it is larger than the sum of its proper divisors (16052243967).

25445136321 is a wasteful number, since it uses less digits than its factorization.

25445136321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64782 (or 64779 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The spelling of 25445136321 in words is "twenty-five billion, four hundred forty-five million, one hundred thirty-six thousand, three hundred twenty-one".