25510616161 has 4 divisors (see below), whose sum is σ = 25681828500. Its totient is φ = 25339403824.

The previous prime is 25510616141. The next prime is 25510616167. The reversal of 25510616161 is 16161601552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8328387600 + 17182228561 = 91260^2 + 131081^2 .

It is a cyclic number.

It is not a de Polignac number, because 25510616161 - 2²⁹ = 24973745249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25510616167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85605946 + ... + 85606243.

It is an arithmetic number, because the mean of its divisors is an integer number (6420457125).

Almost surely, 2^25510616161 is an apocalyptic number.

It is an amenable number.

25510616161 is a deficient number, since it is larger than the sum of its proper divisors (171212339).

25510616161 is a wasteful number, since it uses less digits than its factorization.

25510616161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171212338.

The product of its (nonzero) digits is 10800, while the sum is 34.

The spelling of 25510616161 in words is "twenty-five billion, five hundred ten million, six hundred sixteen thousand, one hundred sixty-one".