25611868707489 has 15 divisors (see below), whose sum is σ = 38259773146243. Its totient is φ = 17074548773424.

The previous prime is 25611868707487. The next prime is 25611868707497. The reversal of 25611868707489 is 98470786811652.

It is a happy number.

The square root of 25611868707489 is 5060817.

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

25611868707489 is a `hidden beast` number, since 2 + 5 + 6 + 1 + 18 + 68 + 70 + 7 + 489 = 666.

It can be written as a sum of positive squares in only one way, i.e., 25102655165025 + 509213542464 = 5010255^2 + 713592^2 .

It is not a de Polignac number, because 25611868707489 - 2¹ = 25611868707487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25611868707487) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 45266197 + ... + 45828509.

Almost surely, 2^{25611868707489} is an apocalyptic number.

25611868707489 is the 5060817-th square number.

25611868707489 is the 2530409-th centered octagonal number.

It is an amenable number.

25611868707489 is a deficient number, since it is larger than the sum of its proper divisors (12647904438754).

25611868707489 is an frugal number, since it uses more digits than its factorization.

25611868707489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124638 (or 562316 counting only the distinct ones).

The product of its (nonzero) digits is 325140480, while the sum is 72.

The spelling of 25611868707489 in words is "twenty-five trillion, six hundred eleven billion, eight hundred sixty-eight million, seven hundred seven thousand, four hundred eighty-nine".