25685021615428 has 48 divisors (see below), whose sum is σ = 55451920769280. Its totient is φ = 10166185459584.

The previous prime is 25685021615411. The next prime is 25685021615453. The reversal of 25685021615428 is 82451612058652.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 687629151 + ... + 687666502.

It is an arithmetic number, because the mean of its divisors is an integer number (1155248349360).

Almost surely, 2^{25685021615428} is an apocalyptic number.

25685021615428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

25685021615428 is an abundant number, since it is smaller than the sum of its proper divisors (29766899153852).

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

25685021615428 is a wasteful number, since it uses less digits than its factorization.

25685021615428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375295716 (or 1375295714 counting only the distinct ones).

The product of its (nonzero) digits is 9216000, while the sum is 55.

The spelling of 25685021615428 in words is "twenty-five trillion, six hundred eighty-five billion, twenty-one million, six hundred fifteen thousand, four hundred twenty-eight".