25536663161 has 8 divisors (see below), whose sum is σ = 25644045960. Its totient is φ = 25429495168.

The previous prime is 25536663151. The next prime is 25536663167. The reversal of 25536663161 is 16136663552.

It can be written as a sum of positive squares in 4 ways, for example, as 2309379136 + 23227284025 = 48056^2 + 152405^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25536663161 - 2¹⁸ = 25536401017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25536663167) by changing a digit.

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, 186815 + ... + 293211.

It is an arithmetic number, because the mean of its divisors is an integer number (3205505745).

Almost surely, 2^25536663161 is an apocalyptic number.

It is an amenable number.

25536663161 is a deficient number, since it is larger than the sum of its proper divisors (107382799).

25536663161 is a wasteful number, since it uses less digits than its factorization.

25536663161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107403.

The product of its digits is 583200, while the sum is 44.

The spelling of 25536663161 in words is "twenty-five billion, five hundred thirty-six million, six hundred sixty-three thousand, one hundred sixty-one".