1252240666 has 4 divisors (see below), whose sum is σ = 1878361002. Its totient is φ = 626120332.

The previous prime is 1252240651. The next prime is 1252240741. The reversal of 1252240666 is 6660422521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6660422521 = 43 ⋅154893547.

It can be written as a sum of positive squares in only one way, i.e., 1220035041 + 32205625 = 34929^2 + 5675^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313060165 + ... + 313060168.

Almost surely, 2^1252240666 is an apocalyptic number.

1252240666 is a deficient number, since it is larger than the sum of its proper divisors (626120336).

1252240666 is an equidigital number, since it uses as much as digits as its factorization.

1252240666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626120335.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 1252240666 is about 35387.0126741436. The cubic root of 1252240666 is about 1077.8606099523.

The spelling of 1252240666 in words is "one billion, two hundred fifty-two million, two hundred forty thousand, six hundred sixty-six".