125555553 has 24 divisors (see below), whose sum is σ = 191362080. Its totient is φ = 79107840.

The previous prime is 125555531. The next prime is 125555567. The reversal of 125555553 is 355555521.

125555553 is a `hidden beast` number, since 1 + 2 + 55 + 55 + 553 = 666.

It is not a de Polignac number, because 125555553 - 2¹⁰ = 125554529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125555153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114538 + ... + 115628.

It is an arithmetic number, because the mean of its divisors is an integer number (7973420).

Almost surely, 2^125555553 is an apocalyptic number.

It is an amenable number.

125555553 is a deficient number, since it is larger than the sum of its proper divisors (65806527).

125555553 is a wasteful number, since it uses less digits than its factorization.

125555553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789 (or 1786 counting only the distinct ones).

The product of its digits is 93750, while the sum is 36.

The square root of 125555553 is about 11205.1574286130. The cubic root of 125555553 is about 500.7396426513.

The spelling of 125555553 in words is "one hundred twenty-five million, five hundred fifty-five thousand, five hundred fifty-three".