1266258641 has 2 divisors, whose sum is σ = 1266258642. Its totient is φ = 1266258640.

The previous prime is 1266258613. The next prime is 1266258671. The reversal of 1266258641 is 1468526621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1264513600 + 1745041 = 35560^2 + 1321^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1266258641 is a prime.

It is not a weakly prime, because it can be changed into another prime (1266258671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633129320 + 633129321.

It is an arithmetic number, because the mean of its divisors is an integer number (633129321).

Almost surely, 2^1266258641 is an apocalyptic number.

It is an amenable number.

1266258641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266258641 is an equidigital number, since it uses as much as digits as its factorization.

1266258641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 41.

The square root of 1266258641 is about 35584.5281126503. The cubic root of 1266258641 is about 1081.8676648400.

The spelling of 1266258641 in words is "one billion, two hundred sixty-six million, two hundred fifty-eight thousand, six hundred forty-one".