126721583045 has 8 divisors (see below), whose sum is σ = 154935067896. Its totient is φ = 99464487616.

The previous prime is 126721583041. The next prime is 126721583047. The reversal of 126721583045 is 540385127621.

It can be written as a sum of positive squares in 4 ways, for example, as 16848559204 + 109873023841 = 129802^2 + 331471^2 .

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 126721583045 - 2² = 126721583041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 126721582987 and 126721583005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126721583041) 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 7 ways as a sum of consecutive naturals, for example, 239097062 + ... + 239097591.

It is an arithmetic number, because the mean of its divisors is an integer number (19366883487).

Almost surely, 2^126721583045 is an apocalyptic number.

It is an amenable number.

126721583045 is a deficient number, since it is larger than the sum of its proper divisors (28213484851).

126721583045 is an equidigital number, since it uses as much as digits as its factorization.

126721583045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478194711.

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 126721583045 in words is "one hundred twenty-six billion, seven hundred twenty-one million, five hundred eighty-three thousand, forty-five".