125387666 has 4 divisors (see below), whose sum is σ = 188081502. Its totient is φ = 62693832.

The previous prime is 125387663. The next prime is 125387671. The reversal of 125387666 is 666783521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666783521 = 137 ⋅4867033.

It can be written as a sum of positive squares in only one way, i.e., 72607441 + 52780225 = 8521^2 + 7265^2 .

It is not an unprimeable number, because it can be changed into a prime (125387663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31346915 + ... + 31346918.

Almost surely, 2^125387666 is an apocalyptic number.

125387666 is a deficient number, since it is larger than the sum of its proper divisors (62693836).

125387666 is an equidigital number, since it uses as much as digits as its factorization.

125387666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62693835.

The product of its digits is 362880, while the sum is 44.

The square root of 125387666 is about 11197.6634169812. The cubic root of 125387666 is about 500.5163545723.

The spelling of 125387666 in words is "one hundred twenty-five million, three hundred eighty-seven thousand, six hundred sixty-six".