1266622543 has 2 divisors, whose sum is σ = 1266622544. Its totient is φ = 1266622542.

The previous prime is 1266622541. The next prime is 1266622547. The reversal of 1266622543 is 3452266621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1266622543 - 2¹ = 1266622541 is a prime.

Together with 1266622541, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266622541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633311271 + 633311272.

It is an arithmetic number, because the mean of its divisors is an integer number (633311272).

Almost surely, 2^1266622543 is an apocalyptic number.

1266622543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266622543 is an equidigital number, since it uses as much as digits as its factorization.

1266622543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 37.

The square root of 1266622543 is about 35589.6409507036. The cubic root of 1266622543 is about 1081.9712919313.

The spelling of 1266622543 in words is "one billion, two hundred sixty-six million, six hundred twenty-two thousand, five hundred forty-three".