25605620440 has 32 divisors (see below), whose sum is σ = 57914300160. Its totient is φ = 10188620800.

The previous prime is 25605620431. The next prime is 25605620449. The reversal of 25605620440 is 4402650652.

It is an interprime number because it is at equal distance from previous prime (25605620431) and next prime (25605620449).

It is a junction number, because it is equal to n+sod(n) for n = 25605620396 and 25605620405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25605620449) 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, 1668121 + ... + 1683400.

It is an arithmetic number, because the mean of its divisors is an integer number (1809821880).

Almost surely, 2^25605620440 is an apocalyptic number.

25605620440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25605620440 is an abundant number, since it is smaller than the sum of its proper divisors (32308679720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25605620440 is a wasteful number, since it uses less digits than its factorization.

25605620440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3351723 (or 3351719 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

The spelling of 25605620440 in words is "twenty-five billion, six hundred five million, six hundred twenty thousand, four hundred forty".