1266254543 has 4 divisors (see below), whose sum is σ = 1266891888. Its totient is φ = 1265617200.

The previous prime is 1266254513. The next prime is 1266254567. The reversal of 1266254543 is 3454526621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1266254543 - 2¹⁶ = 1266189007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1266254497 and 1266254506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266254513) 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 in 3 ways as a sum of consecutive naturals, for example, 315683 + ... + 319668.

It is an arithmetic number, because the mean of its divisors is an integer number (316722972).

Almost surely, 2^1266254543 is an apocalyptic number.

1266254543 is a deficient number, since it is larger than the sum of its proper divisors (637345).

1266254543 is an equidigital number, since it uses as much as digits as its factorization.

1266254543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637344.

The product of its digits is 172800, while the sum is 38.

The square root of 1266254543 is about 35584.4705313989. The cubic root of 1266254543 is about 1081.8664977539.

The spelling of 1266254543 in words is "one billion, two hundred sixty-six million, two hundred fifty-four thousand, five hundred forty-three".