25256359136421 has 24 divisors (see below), whose sum is σ = 41948822826560. Its totient is φ = 14343664078656.

The previous prime is 25256359136419. The next prime is 25256359136453. The reversal of 25256359136421 is 12463195365252.

25256359136421 is a `hidden beast` number, since 2 + 5 + 2 + 5 + 6 + 3 + 591 + 3 + 6 + 42 + 1 = 666.

It is not a de Polignac number, because 25256359136421 - 2¹ = 25256359136419 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25256359134421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1229727736 + ... + 1229748273.

Almost surely, 2^{25256359136421} is an apocalyptic number.

25256359136421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25256359136421 is a deficient number, since it is larger than the sum of its proper divisors (16692463690139).

25256359136421 is a wasteful number, since it uses less digits than its factorization.

25256359136421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2459476185 (or 2459476182 counting only the distinct ones).

The product of its digits is 11664000, while the sum is 54.

The spelling of 25256359136421 in words is "twenty-five trillion, two hundred fifty-six billion, three hundred fifty-nine million, one hundred thirty-six thousand, four hundred twenty-one".