126205444733891 has 2 divisors, whose sum is σ = 126205444733892. Its totient is φ = 126205444733890.

The previous prime is 126205444733651. The next prime is 126205444733909. The reversal of 126205444733891 is 198337444502621.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 126205444733891 - 2³⁴ = 126188264864707 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 126205444733891.

It is not a weakly prime, because it can be changed into another prime (126205444753891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63102722366945 + 63102722366946.

It is an arithmetic number, because the mean of its divisors is an integer number (63102722366946).

It is a 1-persistent number, because it is pandigital, but 2⋅126205444733891 = 252410889467782 is not.

Almost surely, 2^{126205444733891} is an apocalyptic number.

126205444733891 is a deficient number, since it is larger than the sum of its proper divisors (1).

126205444733891 is an equidigital number, since it uses as much as digits as its factorization.

126205444733891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34836480, while the sum is 59.

The spelling of 126205444733891 in words is "one hundred twenty-six trillion, two hundred five billion, four hundred forty-four million, seven hundred thirty-three thousand, eight hundred ninety-one".