25821625845 has 16 divisors (see below), whose sum is σ = 41381576640. Its totient is φ = 13749208704.

The previous prime is 25821625829. The next prime is 25821625849. The reversal of 25821625845 is 54852612852.

It is not a de Polignac number, because 25821625845 - 2⁴ = 25821625829 is a prime.

It is a super-2 number, since 2×25821625845² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25821625794 and 25821625803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25821625849) 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, 1385755 + ... + 1404264.

It is an arithmetic number, because the mean of its divisors is an integer number (2586348540).

Almost surely, 2^25821625845 is an apocalyptic number.

It is an amenable number.

25821625845 is a deficient number, since it is larger than the sum of its proper divisors (15559950795).

25821625845 is a wasteful number, since it uses less digits than its factorization.

25821625845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2790644.

The product of its digits is 1536000, while the sum is 48.

The spelling of 25821625845 in words is "twenty-five billion, eight hundred twenty-one million, six hundred twenty-five thousand, eight hundred forty-five".