66345209985 has 16 divisors (see below), whose sum is σ = 106685769600. Its totient is φ = 35206300800.

The previous prime is 66345209929. The next prime is 66345210007. The reversal of 66345209985 is 58990254366.

66345209985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66345209985 - 2⁶ = 66345209921 is a prime.

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, 11110116 + ... + 11116085.

It is an arithmetic number, because the mean of its divisors is an integer number (6667860600).

Almost surely, 2^66345209985 is an apocalyptic number.

It is an amenable number.

66345209985 is a deficient number, since it is larger than the sum of its proper divisors (40340559615).

66345209985 is a wasteful number, since it uses less digits than its factorization.

66345209985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22226408.

The product of its (nonzero) digits is 13996800, while the sum is 57.

The spelling of 66345209985 in words is "sixty-six billion, three hundred forty-five million, two hundred nine thousand, nine hundred eighty-five".