66209427678 has 32 divisors (see below), whose sum is σ = 134609317920. Its totient is φ = 21707688960.

The previous prime is 66209427673. The next prime is 66209427679. The reversal of 66209427678 is 87672490266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66209427673) 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, 279883 + ... + 459078.

It is an arithmetic number, because the mean of its divisors is an integer number (4206541185).

Almost surely, 2^66209427678 is an apocalyptic number.

66209427678 is an abundant number, since it is smaller than the sum of its proper divisors (68399890242).

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

66209427678 is a wasteful number, since it uses less digits than its factorization.

66209427678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739212.

The product of its (nonzero) digits is 12192768, while the sum is 57.

The spelling of 66209427678 in words is "sixty-six billion, two hundred nine million, four hundred twenty-seven thousand, six hundred seventy-eight".