66651015666 has 8 divisors (see below), whose sum is σ = 133302031344. Its totient is φ = 22217005220.

The previous prime is 66651015647. The next prime is 66651015707.

66651015666 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

66651015666 is an admirable 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, 5554251300 + ... + 5554251311.

It is an arithmetic number, because the mean of its divisors is an integer number (16662753918).

Almost surely, 2^66651015666 is an apocalyptic number.

66651015666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66651015666 is a wasteful number, since it uses less digits than its factorization.

66651015666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11108502616.

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 66651015666 in words is "sixty-six billion, six hundred fifty-one million, fifteen thousand, six hundred sixty-six".