125540665 has 8 divisors (see below), whose sum is σ = 159510600. Its totient is φ = 94524672.

The previous prime is 125540659. The next prime is 125540689. The reversal of 125540665 is 566045521.

It can be written as a sum of positive squares in 4 ways, for example, as 32398864 + 93141801 = 5692^2 + 9651^2 .

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 125540665 - 2⁷ = 125540537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125540665.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 738390 + ... + 738559.

It is an arithmetic number, because the mean of its divisors is an integer number (19938825).

Almost surely, 2^125540665 is an apocalyptic number.

It is an amenable number.

125540665 is a deficient number, since it is larger than the sum of its proper divisors (33969935).

125540665 is a wasteful number, since it uses less digits than its factorization.

125540665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476971.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 125540665 is about 11204.4930719779. The cubic root of 125540665 is about 500.7198498018.

The spelling of 125540665 in words is "one hundred twenty-five million, five hundred forty thousand, six hundred sixty-five".