66706344489511 has 16 divisors (see below), whose sum is σ = 69020742536064. Its totient is φ = 64432221837984.

The previous prime is 66706344489481. The next prime is 66706344489553. The reversal of 66706344489511 is 11598444360766.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66706344489511 - 2⁷ = 66706344489383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66706344484511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 285076 + ... + 11553958.

It is an arithmetic number, because the mean of its divisors is an integer number (4313796408504).

Almost surely, 2^{66706344489511} is an apocalyptic number.

66706344489511 is a deficient number, since it is larger than the sum of its proper divisors (2314398046553).

66706344489511 is a wasteful number, since it uses less digits than its factorization.

66706344489511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11270670.

The product of its (nonzero) digits is 104509440, while the sum is 64.

The spelling of 66706344489511 in words is "sixty-six trillion, seven hundred six billion, three hundred forty-four million, four hundred eighty-nine thousand, five hundred eleven".