125536866 has 64 divisors (see below), whose sum is σ = 316259328. Its totient is φ = 32332608.

The previous prime is 125536861. The next prime is 125536867. The reversal of 125536866 is 668635521.

It is a happy number.

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 Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (125536861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20805 + ... + 26151.

It is an arithmetic number, because the mean of its divisors is an integer number (4941552).

Almost surely, 2^125536866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 125536866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158129664).

125536866 is an abundant number, since it is smaller than the sum of its proper divisors (190722462).

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

125536866 is a wasteful number, since it uses less digits than its factorization.

125536866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5415.

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

The square root of 125536866 is about 11204.3235404910. The cubic root of 125536866 is about 500.7147989712.

The spelling of 125536866 in words is "one hundred twenty-five million, five hundred thirty-six thousand, eight hundred sixty-six".