125940642689 has 8 divisors (see below), whose sum is σ = 127441486080. Its totient is φ = 124441705696.

The previous prime is 125940642643. The next prime is 125940642697. The reversal of 125940642689 is 986246049521.

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

It is a cyclic number.

It is not a de Polignac number, because 125940642689 - 2⁸ = 125940642433 is a prime.

It is a super-2 number, since 2×125940642689² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125940642089) 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, 343469 + ... + 608154.

It is an arithmetic number, because the mean of its divisors is an integer number (15930185760).

Almost surely, 2^125940642689 is an apocalyptic number.

It is an amenable number.

125940642689 is a deficient number, since it is larger than the sum of its proper divisors (1500843391).

125940642689 is an equidigital number, since it uses as much as digits as its factorization.

125940642689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953199.

The product of its (nonzero) digits is 7464960, while the sum is 56.

The spelling of 125940642689 in words is "one hundred twenty-five billion, nine hundred forty million, six hundred forty-two thousand, six hundred eighty-nine".