125720666 has 4 divisors (see below), whose sum is σ = 188581002. Its totient is φ = 62860332.

The previous prime is 125720591. The next prime is 125720671. The reversal of 125720666 is 666027521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666027521 = 53 ⋅12566557.

It can be written as a sum of positive squares in only one way, i.e., 76930441 + 48790225 = 8771^2 + 6985^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31430165 + ... + 31430168.

Almost surely, 2^125720666 is an apocalyptic number.

125720666 is a deficient number, since it is larger than the sum of its proper divisors (62860336).

125720666 is an equidigital number, since it uses as much as digits as its factorization.

125720666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62860335.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 125720666 is about 11212.5227313036. The cubic root of 125720666 is about 500.9590472805.

The spelling of 125720666 in words is "one hundred twenty-five million, seven hundred twenty thousand, six hundred sixty-six".