125565558 has 8 divisors (see below), whose sum is σ = 251131128. Its totient is φ = 41855184.

The previous prime is 125565551. The next prime is 125565589. The reversal of 125565558 is 855565521.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

125565558 is an admirable number.

It is a super-3 number, since 3×125565558³ (a number of 25 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125565551) 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, 10463791 + ... + 10463802.

It is an arithmetic number, because the mean of its divisors is an integer number (31391391).

Almost surely, 2^125565558 is an apocalyptic number.

125565558 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

125565558 is a wasteful number, since it uses less digits than its factorization.

125565558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20927598.

The product of its digits is 300000, while the sum is 42.

The square root of 125565558 is about 11205.6038659235. The cubic root of 125565558 is about 500.7529429181.

The spelling of 125565558 in words is "one hundred twenty-five million, five hundred sixty-five thousand, five hundred fifty-eight".