1266155263 has 2 divisors, whose sum is σ = 1266155264. Its totient is φ = 1266155262.

The previous prime is 1266155251. The next prime is 1266155279. The reversal of 1266155263 is 3625516621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1266155263 - 2²¹ = 1264058111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266155203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633077631 + 633077632.

It is an arithmetic number, because the mean of its divisors is an integer number (633077632).

Almost surely, 2^1266155263 is an apocalyptic number.

1266155263 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266155263 is an equidigital number, since it uses as much as digits as its factorization.

1266155263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 37.

The square root of 1266155263 is about 35583.0755135078. The cubic root of 1266155263 is about 1081.8382226298.

The spelling of 1266155263 in words is "one billion, two hundred sixty-six million, one hundred fifty-five thousand, two hundred sixty-three".