1266368557 has 2 divisors, whose sum is σ = 1266368558. Its totient is φ = 1266368556.

The previous prime is 1266368531. The next prime is 1266368627. The reversal of 1266368557 is 7558636621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1001785801 + 264582756 = 31651^2 + 16266^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266368557 - 2¹⁵ = 1266335789 is a prime.

It is a super-3 number, since 3×1266368557³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1266368557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266368527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633184278 + 633184279.

It is an arithmetic number, because the mean of its divisors is an integer number (633184279).

Almost surely, 2^1266368557 is an apocalyptic number.

It is an amenable number.

1266368557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266368557 is an equidigital number, since it uses as much as digits as its factorization.

1266368557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 49.

The square root of 1266368557 is about 35586.0725143981. The cubic root of 1266368557 is about 1081.8989673248.

The spelling of 1266368557 in words is "one billion, two hundred sixty-six million, three hundred sixty-eight thousand, five hundred fifty-seven".