125666329 has 4 divisors (see below), whose sum is σ = 133058484. Its totient is φ = 118274176.

The previous prime is 125666287. The next prime is 125666341. The reversal of 125666329 is 923666521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 923666521 = 509 ⋅1814669.

It can be written as a sum of positive squares in 2 ways, for example, as 36929929 + 88736400 = 6077^2 + 9420^2 .

It is a cyclic number.

It is not a de Polignac number, because 125666329 - 2⁷ = 125666201 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 125666291 and 125666300.

It is not an unprimeable number, because it can be changed into a prime (125666369) 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, 3696052 + ... + 3696085.

It is an arithmetic number, because the mean of its divisors is an integer number (33264621).

Almost surely, 2^125666329 is an apocalyptic number.

It is an amenable number.

125666329 is a deficient number, since it is larger than the sum of its proper divisors (7392155).

125666329 is an equidigital number, since it uses as much as digits as its factorization.

125666329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7392154.

The product of its digits is 116640, while the sum is 40.

The square root of 125666329 is about 11210.0994197197. The cubic root of 125666329 is about 500.8868646787.

The spelling of 125666329 in words is "one hundred twenty-five million, six hundred sixty-six thousand, three hundred twenty-nine".