66773715456 has 80 divisors (see below), whose sum is σ = 203302148544. Its totient is φ = 19078201344.

The previous prime is 66773715431. The next prime is 66773715461. The reversal of 66773715456 is 65451737766.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66773715396 and 66773715405.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3094425 + ... + 3115928.

Almost surely, 2^66773715456 is an apocalyptic number.

It is an amenable number.

66773715456 is an abundant number, since it is smaller than the sum of its proper divisors (136528433088).

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

66773715456 is an equidigital number, since it uses as much as digits as its factorization.

66773715456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6210381 (or 6210365 counting only the distinct ones).

The product of its digits is 22226400, while the sum is 57.

The spelling of 66773715456 in words is "sixty-six billion, seven hundred seventy-three million, seven hundred fifteen thousand, four hundred fifty-six".