126556563 has 12 divisors (see below), whose sum is σ = 196292040. Its totient is φ = 72317952.

The previous prime is 126556489. The next prime is 126556589. The reversal of 126556563 is 365655621.

It is not a de Polignac number, because 126556563 - 2¹³ = 126548371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126556363) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 430318 + ... + 430611.

It is an arithmetic number, because the mean of its divisors is an integer number (16357670).

Almost surely, 2^126556563 is an apocalyptic number.

126556563 is a deficient number, since it is larger than the sum of its proper divisors (69735477).

126556563 is an equidigital number, since it uses as much as digits as its factorization.

126556563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860946 (or 860939 counting only the distinct ones).

The product of its digits is 162000, while the sum is 39.

The square root of 126556563 is about 11249.7361302388. The cubic root of 126556563 is about 502.0668617259.

The spelling of 126556563 in words is "one hundred twenty-six million, five hundred fifty-six thousand, five hundred sixty-three".