126321444563 has 4 divisors (see below), whose sum is σ = 129402455448. Its totient is φ = 123240433680.

The previous prime is 126321444541. The next prime is 126321444581. The reversal of 126321444563 is 365444123621.

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 126321444563 - 2⁶ = 126321444499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 3081010843 = 126321444563 / (1 + 2 + 6 + 3 + 2 + 1 + 4 + 4 + 4 + 5 + 6 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126321444563.

It is not an unprimeable number, because it can be changed into a prime (126321444863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1540505381 + ... + 1540505462.

It is an arithmetic number, because the mean of its divisors is an integer number (32350613862).

Almost surely, 2^126321444563 is an apocalyptic number.

126321444563 is a deficient number, since it is larger than the sum of its proper divisors (3081010885).

126321444563 is an equidigital number, since it uses as much as digits as its factorization.

126321444563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3081010884.

The product of its digits is 414720, while the sum is 41.

The spelling of 126321444563 in words is "one hundred twenty-six billion, three hundred twenty-one million, four hundred forty-four thousand, five hundred sixty-three".