66544616011 has 4 divisors (see below), whose sum is σ = 66546311832. Its totient is φ = 66542920192.

The previous prime is 66544615937. The next prime is 66544616053. The reversal of 66544616011 is 11061644566.

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 66544616011 - 2¹³ = 66544607819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66544646011) 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, 787621 + ... + 868006.

It is an arithmetic number, because the mean of its divisors is an integer number (16636577958).

Almost surely, 2^66544616011 is an apocalyptic number.

66544616011 is a deficient number, since it is larger than the sum of its proper divisors (1695821).

66544616011 is a wasteful number, since it uses less digits than its factorization.

66544616011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1695820.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 66544616011 in words is "sixty-six billion, five hundred forty-four million, six hundred sixteen thousand, eleven".