12643437156001 has 8 divisors (see below), whose sum is σ = 12660651154440. Its totient is φ = 12626227074048.

The previous prime is 12643437155971. The next prime is 12643437156013. The reversal of 12643437156001 is 10065173434621.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4938066174976 + 7705370981025 = 2222176^2 + 2775855^2 .

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 12643437156001 - 2¹⁹ = 12643436631713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12643437196001) 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, 5511045 + ... + 7460461.

It is an arithmetic number, because the mean of its divisors is an integer number (1582581394305).

Almost surely, 2^{12643437156001} is an apocalyptic number.

It is an amenable number.

12643437156001 is a deficient number, since it is larger than the sum of its proper divisors (17213998439).

12643437156001 is an equidigital number, since it uses as much as digits as its factorization.

12643437156001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1958243.

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 12643437156001 in words is "twelve trillion, six hundred forty-three billion, four hundred thirty-seven million, one hundred fifty-six thousand, one".