25525412505 has 24 divisors (see below), whose sum is σ = 44850136968. Its totient is φ = 13427064576.

The previous prime is 25525412461. The next prime is 25525412513. The reversal of 25525412505 is 50521452552.

25525412505 is a `hidden beast` number, since 2 + 5 + 525 + 4 + 125 + 0 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 9631263321 + 15894149184 = 98139^2 + 126072^2 .

It is not a de Polignac number, because 25525412505 - 2⁶ = 25525412441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25525412505.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3881862 + ... + 3888431.

It is an arithmetic number, because the mean of its divisors is an integer number (1868755707).

Almost surely, 2^25525412505 is an apocalyptic number.

It is an amenable number.

25525412505 is a deficient number, since it is larger than the sum of its proper divisors (19324724463).

25525412505 is a wasteful number, since it uses less digits than its factorization.

25525412505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7770377 (or 7770374 counting only the distinct ones).

The product of its (nonzero) digits is 100000, while the sum is 36.

The spelling of 25525412505 in words is "twenty-five billion, five hundred twenty-five million, four hundred twelve thousand, five hundred five".