66208051216 has 20 divisors (see below), whose sum is σ = 135823870332. Its totient is φ = 31156729856.

The previous prime is 66208051207. The next prime is 66208051297. The reversal of 66208051216 is 61215080266.

It can be written as a sum of positive squares in 2 ways, for example, as 42933497616 + 23274553600 = 207204^2 + 152560^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121705705 + ... + 121706248.

Almost surely, 2^66208051216 is an apocalyptic number.

It is an amenable number.

66208051216 is an abundant number, since it is smaller than the sum of its proper divisors (69615819116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66208051216 is a wasteful number, since it uses less digits than its factorization.

66208051216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243411978 (or 243411972 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 66208051216 in words is "sixty-six billion, two hundred eight million, fifty-one thousand, two hundred sixteen".