66444351006443 has 4 divisors (see below), whose sum is σ = 66444593966520. Its totient is φ = 66444108046368.

The previous prime is 66444351006437. The next prime is 66444351006503. The reversal of 66444351006443 is 34460015344466.

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

It is a cyclic number.

It is not a de Polignac number, because 66444351006443 - 2³⁰ = 66443277264619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66444351006391 and 66444351006400.

It is not an unprimeable number, because it can be changed into a prime (66444351006643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121069358 + ... + 121616931.

It is an arithmetic number, because the mean of its divisors is an integer number (16611148491630).

Almost surely, 2^{66444351006443} is an apocalyptic number.

66444351006443 is a deficient number, since it is larger than the sum of its proper divisors (242960077).

66444351006443 is a wasteful number, since it uses less digits than its factorization.

66444351006443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242960076.

The product of its (nonzero) digits is 9953280, while the sum is 50.

The spelling of 66444351006443 in words is "sixty-six trillion, four hundred forty-four billion, three hundred fifty-one million, six thousand, four hundred forty-three".