66817732480 has 64 divisors (see below), whose sum is σ = 161201779200. Its totient is φ = 26481862656.

The previous prime is 66817732477. The next prime is 66817732543. The reversal of 66817732480 is 8423771866.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 409152 + ... + 548671.

It is an arithmetic number, because the mean of its divisors is an integer number (2518777800).

Almost surely, 2^66817732480 is an apocalyptic number.

It is an amenable number.

66817732480 is an abundant number, since it is smaller than the sum of its proper divisors (94384046720).

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

66817732480 is a wasteful number, since it uses less digits than its factorization.

66817732480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957951 (or 957939 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 52.

The spelling of 66817732480 in words is "sixty-six billion, eight hundred seventeen million, seven hundred thirty-two thousand, four hundred eighty".