125566638 has 16 divisors (see below), whose sum is σ = 251323776. Its totient is φ = 41823800.

The previous prime is 125566631. The next prime is 125566663. The reversal of 125566638 is 836665521.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 125566638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125566631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1495 + ... + 15917.

It is an arithmetic number, because the mean of its divisors is an integer number (15707736).

Almost surely, 2^125566638 is an apocalyptic number.

125566638 is an abundant number, since it is smaller than the sum of its proper divisors (125757138).

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

125566638 is a wasteful number, since it uses less digits than its factorization.

125566638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15879.

The product of its digits is 259200, while the sum is 42.

The square root of 125566638 is about 11205.6520559939. The cubic root of 125566638 is about 500.7543785868.

It can be divided in two parts, 125566 and 638, that multiplied together give a palindrome (80111108).

The spelling of 125566638 in words is "one hundred twenty-five million, five hundred sixty-six thousand, six hundred thirty-eight".