66320105665445 has 16 divisors (see below), whose sum is σ = 80120125641600. Its totient is φ = 52698768657600.

The previous prime is 66320105665441. The next prime is 66320105665453. The reversal of 66320105665445 is 54456650102366.

It is not a de Polignac number, because 66320105665445 - 2² = 66320105665441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66320105665441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31454210 + ... + 33496380.

It is an arithmetic number, because the mean of its divisors is an integer number (5007507852600).

Almost surely, 2^{66320105665445} is an apocalyptic number.

It is an amenable number.

66320105665445 is a deficient number, since it is larger than the sum of its proper divisors (13800019976155).

66320105665445 is a wasteful number, since it uses less digits than its factorization.

66320105665445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2085916.

The product of its (nonzero) digits is 15552000, while the sum is 53.

The spelling of 66320105665445 in words is "sixty-six trillion, three hundred twenty billion, one hundred five million, six hundred sixty-five thousand, four hundred forty-five".