125668559 has 4 divisors (see below), whose sum is σ = 126217560. Its totient is φ = 125119560.

The previous prime is 125668547. The next prime is 125668577. The reversal of 125668559 is 955866521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 955866521 = 131 ⋅7296691.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125668559 is a prime.

It is a super-2 number, since 2×125668559² = 31585173442272962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125668519) 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, 274157 + ... + 274614.

It is an arithmetic number, because the mean of its divisors is an integer number (31554390).

Almost surely, 2^125668559 is an apocalyptic number.

125668559 is a deficient number, since it is larger than the sum of its proper divisors (549001).

125668559 is an equidigital number, since it uses as much as digits as its factorization.

125668559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549000.

The product of its digits is 648000, while the sum is 47.

The square root of 125668559 is about 11210.1988831599. The cubic root of 125668559 is about 500.8898274747.

The spelling of 125668559 in words is "one hundred twenty-five million, six hundred sixty-eight thousand, five hundred fifty-nine".