126556434302321 has 8 divisors (see below), whose sum is σ = 130124411852904. Its totient is φ = 122996221666560.

The previous prime is 126556434302273. The next prime is 126556434302351. The reversal of 126556434302321 is 123203434655621.

It can be written as a sum of positive squares in 4 ways, for example, as 53150865335296 + 73405568967025 = 7290464^2 + 8567705^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 126556434302321 - 2³⁸ = 126281556395377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (126556434302351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1941195650 + ... + 1941260843.

It is an arithmetic number, because the mean of its divisors is an integer number (16265551481613).

Almost surely, 2^{126556434302321} is an apocalyptic number.

It is an amenable number.

126556434302321 is a deficient number, since it is larger than the sum of its proper divisors (3567977550583).

126556434302321 is an equidigital number, since it uses as much as digits as its factorization.

126556434302321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3882457411.

The product of its (nonzero) digits is 3110400, while the sum is 47.

Adding to 126556434302321 its reverse (123203434655621), we get a palindrome (249759868957942).

The spelling of 126556434302321 in words is "one hundred twenty-six trillion, five hundred fifty-six billion, four hundred thirty-four million, three hundred two thousand, three hundred twenty-one".