25385528646 has 12 divisors (see below), whose sum is σ = 55001978772. Its totient is φ = 8461842876.

The previous prime is 25385528611. The next prime is 25385528699. The reversal of 25385528646 is 64682558352.

25385528646 is a `hidden beast` number, since 2 + 5 + 3 + 8 + 552 + 86 + 4 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 25385528592 and 25385528601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 705153556 + ... + 705153591.

It is an arithmetic number, because the mean of its divisors is an integer number (4583498231).

Almost surely, 2^25385528646 is an apocalyptic number.

25385528646 is an abundant number, since it is smaller than the sum of its proper divisors (29616450126).

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

25385528646 is a wasteful number, since it uses less digits than its factorization.

25385528646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410307155 (or 1410307152 counting only the distinct ones).

The product of its digits is 13824000, while the sum is 54.

The spelling of 25385528646 in words is "twenty-five billion, three hundred eighty-five million, five hundred twenty-eight thousand, six hundred forty-six".