25547009904025 has 9 divisors (see below), whose sum is σ = 31678323618333. Its totient is φ = 20437587705600.

The previous prime is 25547009903999. The next prime is 25547009904043. The reversal of 25547009904025 is 52040990074552.

It is a happy number.

The square root of 25547009904025 is 5054405.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 9549601799049 + 15997408104976 = 3090243^2 + 3999676^2 .

It is not a de Polignac number, because 25547009904025 - 2¹⁷ = 25547009772953 is a prime.

It is a super-2 number, since 2×25547009904025² (a number of 28 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 8 ways as a sum of consecutive naturals, for example, 24766585 + ... + 25777465.

Almost surely, 2^{25547009904025} is an apocalyptic number.

25547009904025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

25547009904025 is the 5054405-th square number.

25547009904025 is the 2527203-rd centered octagonal number.

It is an amenable number.

25547009904025 is a deficient number, since it is larger than the sum of its proper divisors (6131313714308).

25547009904025 is an frugal number, since it uses more digits than its factorization.

25547009904025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021772 (or 1010886 counting only the distinct ones).

The product of its (nonzero) digits is 4536000, while the sum is 52.

Adding to 25547009904025 its reverse (52040990074552), we get a palindrome (77587999978577).

The spelling of 25547009904025 in words is "twenty-five trillion, five hundred forty-seven billion, nine million, nine hundred four thousand, twenty-five".