1265226617 has 2 divisors, whose sum is σ = 1265226618. Its totient is φ = 1265226616.

The previous prime is 1265226607. The next prime is 1265226629. The reversal of 1265226617 is 7166225621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 896164096 + 369062521 = 29936^2 + 19211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265226617 - 2⁶ = 1265226553 is a prime.

It is not a weakly prime, because it can be changed into another prime (1265226607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632613308 + 632613309.

It is an arithmetic number, because the mean of its divisors is an integer number (632613309).

Almost surely, 2^1265226617 is an apocalyptic number.

It is an amenable number.

1265226617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265226617 is an equidigital number, since it uses as much as digits as its factorization.

1265226617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 1265226617 is about 35570.0241354993. The cubic root of 1265226617 is about 1081.5736709637.

The spelling of 1265226617 in words is "one billion, two hundred sixty-five million, two hundred twenty-six thousand, six hundred seventeen".