8257999825 has 24 divisors (see below), whose sum is σ = 10326845240. Its totient is φ = 6550502400.

The previous prime is 8257999817. The next prime is 8257999831. The reversal of 8257999825 is 5289997528.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 2452626576 + 5805373249 = 49524^2 + 76193^2 .

It is not a de Polignac number, because 8257999825 - 2³ = 8257999817 is a prime.

It is a super-2 number, since 2×8257999825² (a number of 21 digits) contains 22 as substring.

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, 2121481 + ... + 2125369.

Almost surely, 2^8257999825 is an apocalyptic number.

It is an amenable number.

8257999825 is a deficient number, since it is larger than the sum of its proper divisors (2068845415).

8257999825 is a wasteful number, since it uses less digits than its factorization.

8257999825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4597 (or 4592 counting only the distinct ones).

The product of its digits is 32659200, while the sum is 64.

The square root of 8257999825 is about 90873.5375398141. The cubic root of 8257999825 is about 2021.2729147344.

The spelling of 8257999825 in words is "eight billion, two hundred fifty-seven million, nine hundred ninety-nine thousand, eight hundred twenty-five".