66651066011 has 4 divisors (see below), whose sum is σ = 66733453800. Its totient is φ = 66568678224.

The previous prime is 66651066007. The next prime is 66651066029. The reversal of 66651066011 is 11066015666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66651066011 - 2² = 66651066007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66651066061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41192681 + ... + 41194298.

It is an arithmetic number, because the mean of its divisors is an integer number (16683363450).

Almost surely, 2^66651066011 is an apocalyptic number.

66651066011 is a deficient number, since it is larger than the sum of its proper divisors (82387789).

66651066011 is an equidigital number, since it uses as much as digits as its factorization.

66651066011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82387788.

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 66651066011 in words is "sixty-six billion, six hundred fifty-one million, sixty-six thousand, eleven".