66808808871 has 24 divisors (see below), whose sum is σ = 106422424560. Its totient is φ = 37144662912.

The previous prime is 66808808849. The next prime is 66808808873. The reversal of 66808808871 is 17880880866.

It is not a de Polignac number, because 66808808871 - 2¹³ = 66808800679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66808808873) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6136206 + ... + 6147083.

It is an arithmetic number, because the mean of its divisors is an integer number (4434267690).

Almost surely, 2^66808808871 is an apocalyptic number.

66808808871 is a deficient number, since it is larger than the sum of its proper divisors (39613615689).

66808808871 is a wasteful number, since it uses less digits than its factorization.

66808808871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12283343 (or 12283336 counting only the distinct ones).

The product of its (nonzero) digits is 8257536, while the sum is 60.

The spelling of 66808808871 in words is "sixty-six billion, eight hundred eight million, eight hundred eight thousand, eight hundred seventy-one".