125540666 has 16 divisors (see below), whose sum is σ = 192675456. Its totient is φ = 61320576.

The previous prime is 125540659. The next prime is 125540689. The reversal of 125540666 is 666045521.

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, 73130 + ... + 74826.

It is an arithmetic number, because the mean of its divisors is an integer number (12042216).

Almost surely, 2^125540666 is an apocalyptic number.

125540666 is a deficient number, since it is larger than the sum of its proper divisors (67134790).

125540666 is a wasteful number, since it uses less digits than its factorization.

125540666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 125540666 is about 11204.4931166028. The cubic root of 125540666 is about 500.7198511313.

The spelling of 125540666 in words is "one hundred twenty-five million, five hundred forty thousand, six hundred sixty-six".