1266903245 has 4 divisors (see below), whose sum is σ = 1520283900. Its totient is φ = 1013522592.

The previous prime is 1266903221. The next prime is 1266903263. The reversal of 1266903245 is 5423096621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5423096621 = 397 ⋅13660193.

It can be written as a sum of positive squares in 2 ways, for example, as 142038724 + 1124864521 = 11918^2 + 33539^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266903245 - 2¹² = 1266899149 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1266903199 and 1266903208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126690320 + ... + 126690329.

It is an arithmetic number, because the mean of its divisors is an integer number (380070975).

Almost surely, 2^1266903245 is an apocalyptic number.

It is an amenable number.

1266903245 is a deficient number, since it is larger than the sum of its proper divisors (253380655).

1266903245 is an equidigital number, since it uses as much as digits as its factorization.

1266903245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253380654.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 1266903245 is about 35593.5843235828. The cubic root of 1266903245 is about 1082.0512128923.

Adding to 1266903245 its reverse (5423096621), we get a palindrome (6689999866).

The spelling of 1266903245 in words is "one billion, two hundred sixty-six million, nine hundred three thousand, two hundred forty-five".