25128918025 has 6 divisors (see below), whose sum is σ = 31159858382. Its totient is φ = 20103134400.

The previous prime is 25128917993. The next prime is 25128918047. The reversal of 25128918025 is 52081982152.

It can be written as a sum of positive squares in 3 ways, for example, as 8469336841 + 16659581184 = 92029^2 + 129072^2 .

It is not a de Polignac number, because 25128918025 - 2⁵ = 25128917993 is a prime.

It is a super-2 number, since 2×25128918025² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 502578336 + ... + 502578385.

Almost surely, 2^25128918025 is an apocalyptic number.

25128918025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25128918025 is a deficient number, since it is larger than the sum of its proper divisors (6030940357).

25128918025 is a wasteful number, since it uses less digits than its factorization.

25128918025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005156731 (or 1005156726 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 43.

The spelling of 25128918025 in words is "twenty-five billion, one hundred twenty-eight million, nine hundred eighteen thousand, twenty-five".