25820585923915 has 16 divisors (see below), whose sum is σ = 32342351701248. Its totient is φ = 19751952321376.

The previous prime is 25820585923841. The next prime is 25820585923919. The reversal of 25820585923915 is 51932958502852.

It is not a de Polignac number, because 25820585923915 - 2¹⁷ = 25820585792843 is a prime.

It is a super-3 number, since 3×25820585923915³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25820585923919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36059149 + ... + 36768238.

It is an arithmetic number, because the mean of its divisors is an integer number (2021396981328).

Almost surely, 2^{25820585923915} is an apocalyptic number.

25820585923915 is a deficient number, since it is larger than the sum of its proper divisors (6521765777333).

25820585923915 is a wasteful number, since it uses less digits than its factorization.

25820585923915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72830498.

The product of its (nonzero) digits is 77760000, while the sum is 64.

The spelling of 25820585923915 in words is "twenty-five trillion, eight hundred twenty billion, five hundred eighty-five million, nine hundred twenty-three thousand, nine hundred fifteen".