25220646125 has 8 divisors (see below), whose sum is σ = 31475366520. Its totient is φ = 20176516800.

The previous prime is 25220646107. The next prime is 25220646131. The reversal of 25220646125 is 52164602252.

It can be written as a sum of positive squares in 4 ways, for example, as 5764301929 + 19456344196 = 75923^2 + 139486^2 .

It is not a de Polignac number, because 25220646125 - 2¹⁴ = 25220629741 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100882460 + ... + 100882709.

It is an arithmetic number, because the mean of its divisors is an integer number (3934420815).

Almost surely, 2^25220646125 is an apocalyptic number.

25220646125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25220646125 is a deficient number, since it is larger than the sum of its proper divisors (6254720395).

25220646125 is an equidigital number, since it uses as much as digits as its factorization.

25220646125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201765184 (or 201765174 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The spelling of 25220646125 in words is "twenty-five billion, two hundred twenty million, six hundred forty-six thousand, one hundred twenty-five".