66800006668 has 24 divisors (see below), whose sum is σ = 122002564320. Its totient is φ = 31942606080.

The previous prime is 66800006659. The next prime is 66800006671. The reversal of 66800006668 is 86660000866.

It is a Harshad number since it is a multiple of its sum of digits (46).

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, 539028 + ... + 651268.

It is an arithmetic number, because the mean of its divisors is an integer number (5083440180).

Almost surely, 2^66800006668 is an apocalyptic number.

It is an amenable number.

66800006668 is a deficient number, since it is larger than the sum of its proper divisors (55202557652).

66800006668 is a wasteful number, since it uses less digits than its factorization.

66800006668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118737 (or 118735 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 66800006668 in words is "sixty-six billion, eight hundred million, six thousand, six hundred sixty-eight".