66520212745 has 16 divisors (see below), whose sum is σ = 91254786048. Its totient is φ = 45600327360.

The previous prime is 66520212727. The next prime is 66520212779. The reversal of 66520212745 is 54721202566.

It is a de Polignac number, because none of the positive numbers 2^k-66520212745 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66520212698 and 66520212707.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161554 + ... + 398923.

It is an arithmetic number, because the mean of its divisors is an integer number (5703424128).

Almost surely, 2^66520212745 is an apocalyptic number.

It is an amenable number.

66520212745 is a deficient number, since it is larger than the sum of its proper divisors (24734573303).

66520212745 is a wasteful number, since it uses less digits than its factorization.

66520212745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563880.

The product of its (nonzero) digits is 201600, while the sum is 40.

The spelling of 66520212745 in words is "sixty-six billion, five hundred twenty million, two hundred twelve thousand, seven hundred forty-five".