126203040643 has 4 divisors (see below), whose sum is σ = 132845305960. Its totient is φ = 119560775328.

The previous prime is 126203040631. The next prime is 126203040647. The reversal of 126203040643 is 346040302621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126203040643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126203040647) 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, 3321132630 + ... + 3321132667.

It is an arithmetic number, because the mean of its divisors is an integer number (33211326490).

Almost surely, 2^126203040643 is an apocalyptic number.

126203040643 is a deficient number, since it is larger than the sum of its proper divisors (6642265317).

126203040643 is an equidigital number, since it uses as much as digits as its factorization.

126203040643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6642265316.

The product of its (nonzero) digits is 20736, while the sum is 31.

The spelling of 126203040643 in words is "one hundred twenty-six billion, two hundred three million, forty thousand, six hundred forty-three".