25646320410 has 64 divisors (see below), whose sum is σ = 63298537344. Its totient is φ = 6646169600.

The previous prime is 25646320409. The next prime is 25646320459. The reversal of 25646320410 is 1402364652.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 275545 + ... + 356675.

It is an arithmetic number, because the mean of its divisors is an integer number (989039646).

Almost surely, 2^25646320410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25646320410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31649268672).

25646320410 is an abundant number, since it is smaller than the sum of its proper divisors (37652216934).

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

25646320410 is a wasteful number, since it uses less digits than its factorization.

25646320410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81439.

The product of its (nonzero) digits is 34560, while the sum is 33.

The spelling of 25646320410 in words is "twenty-five billion, six hundred forty-six million, three hundred twenty thousand, four hundred ten".