66686801420 has 12 divisors (see below), whose sum is σ = 140042283024. Its totient is φ = 26674720560.

The previous prime is 66686801417. The next prime is 66686801477. The reversal of 66686801420 is 2410868666.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1667170016 + ... + 1667170055.

It is an arithmetic number, because the mean of its divisors is an integer number (11670190252).

Almost surely, 2^66686801420 is an apocalyptic number.

It is an amenable number.

66686801420 is an abundant number, since it is smaller than the sum of its proper divisors (73355481604).

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

66686801420 is a wasteful number, since it uses less digits than its factorization.

66686801420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3334340080 (or 3334340078 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 47.

The spelling of 66686801420 in words is "sixty-six billion, six hundred eighty-six million, eight hundred one thousand, four hundred twenty".