66489929661311 has 4 divisors (see below), whose sum is σ = 71604539635272. Its totient is φ = 61375319687352.

The previous prime is 66489929661271. The next prime is 66489929661317. The reversal of 66489929661311 is 11316692998466.

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 66489929661311 - 2⁶ = 66489929661247 is a prime.

It is a super-2 number, since 2×66489929661311² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66489929661317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2557304986961 + ... + 2557304986986.

It is an arithmetic number, because the mean of its divisors is an integer number (17901134908818).

Almost surely, 2^{66489929661311} is an apocalyptic number.

66489929661311 is a deficient number, since it is larger than the sum of its proper divisors (5114609973961).

66489929661311 is a wasteful number, since it uses less digits than its factorization.

66489929661311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5114609973960.

The product of its digits is 181398528, while the sum is 71.

The spelling of 66489929661311 in words is "sixty-six trillion, four hundred eighty-nine billion, nine hundred twenty-nine million, six hundred sixty-one thousand, three hundred eleven".