25878857225 has 48 divisors (see below), whose sum is σ = 35268836400. Its totient is φ = 18718801920.

The previous prime is 25878857203. The next prime is 25878857269. The reversal of 25878857225 is 52275887852.

It can be written as a sum of positive squares in 24 ways, for example, as 23450634496 + 2428222729 = 153136^2 + 49277^2 .

It is not a de Polignac number, because 25878857225 - 2¹² = 25878853129 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17379281 + ... + 17380769.

It is an arithmetic number, because the mean of its divisors is an integer number (734767425).

Almost surely, 2^25878857225 is an apocalyptic number.

25878857225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25878857225 is a deficient number, since it is larger than the sum of its proper divisors (9389979175).

25878857225 is a wasteful number, since it uses less digits than its factorization.

25878857225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2574 (or 2569 counting only the distinct ones).

The product of its digits is 25088000, while the sum is 59.

The spelling of 25878857225 in words is "twenty-five billion, eight hundred seventy-eight million, eight hundred fifty-seven thousand, two hundred twenty-five".