66051552666 has 64 divisors (see below), whose sum is σ = 144689982336. Its totient is φ = 19935590400.

The previous prime is 66051552649. The next prime is 66051552673. The reversal of 66051552666 is 66625515066.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19935426 + ... + 19938738.

It is an arithmetic number, because the mean of its divisors is an integer number (2260780974).

Almost surely, 2^66051552666 is an apocalyptic number.

66051552666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66051552666 is an abundant number, since it is smaller than the sum of its proper divisors (78638429670).

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

66051552666 is a wasteful number, since it uses less digits than its factorization.

66051552666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4447.

The product of its (nonzero) digits is 1944000, while the sum is 48.

The spelling of 66051552666 in words is "sixty-six billion, fifty-one million, five hundred fifty-two thousand, six hundred sixty-six".