25531804161 has 24 divisors (see below), whose sum is σ = 39058446024. Its totient is φ = 16015933440.

The previous prime is 25531804147. The next prime is 25531804163. The reversal of 25531804161 is 16140813552.

25531804161 is a `hidden beast` number, since 2 + 5 + 531 + 80 + 41 + 6 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 9635385600 + 15896418561 = 98160^2 + 126081^2 .

It is not a de Polignac number, because 25531804161 - 2¹⁴ = 25531787777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25531804163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 663201 + ... + 700641.

It is an arithmetic number, because the mean of its divisors is an integer number (1627435251).

Almost surely, 2^25531804161 is an apocalyptic number.

It is an amenable number.

25531804161 is a deficient number, since it is larger than the sum of its proper divisors (13526641863).

25531804161 is a wasteful number, since it uses less digits than its factorization.

25531804161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41921 (or 41918 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The spelling of 25531804161 in words is "twenty-five billion, five hundred thirty-one million, eight hundred four thousand, one hundred sixty-one".