25252566516 has 18 divisors (see below), whose sum is σ = 63832876562. Its totient is φ = 8417522160.

The previous prime is 25252566467. The next prime is 25252566517. The reversal of 25252566516 is 61566525252.

25252566516 is a `hidden beast` number, since 2 + 52 + 5 + 25 + 66 + 516 = 666.

It can be written as a sum of positive squares in only one way, i.e., 24965264016 + 287302500 = 158004^2 + 16950^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25252566517) 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 5 ways as a sum of consecutive naturals, for example, 350730055 + ... + 350730126.

Almost surely, 2^25252566516 is an apocalyptic number.

It is an amenable number.

25252566516 is an abundant number, since it is smaller than the sum of its proper divisors (38580310046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25252566516 is a wasteful number, since it uses less digits than its factorization.

25252566516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701460191 (or 701460186 counting only the distinct ones).

The product of its digits is 1080000, while the sum is 45.

The spelling of 25252566516 in words is "twenty-five billion, two hundred fifty-two million, five hundred sixty-six thousand, five hundred sixteen".