66006991647408 has 120 divisors (see below), whose sum is σ = 198852405868080. Its totient is φ = 18812109926400.

The previous prime is 66006991647353. The next prime is 66006991647419. The reversal of 66006991647408 is 80474619960066.

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 23 ways as a sum of consecutive naturals, for example, 34049613 + ... + 35935916.

It is an arithmetic number, because the mean of its divisors is an integer number (1657103382234).

Almost surely, 2^{66006991647408} is an apocalyptic number.

It is an amenable number.

66006991647408 is an abundant number, since it is smaller than the sum of its proper divisors (132845414220672).

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

66006991647408 is a wasteful number, since it uses less digits than its factorization.

66006991647408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69985955 (or 69985942 counting only the distinct ones).

The product of its (nonzero) digits is 94058496, while the sum is 66.

The spelling of 66006991647408 in words is "sixty-six trillion, six billion, nine hundred ninety-one million, six hundred forty-seven thousand, four hundred eight".