66489109664 has 24 divisors (see below), whose sum is σ = 130946432148. Its totient is φ = 33232872960.

The previous prime is 66489109663. The next prime is 66489109669. The reversal of 66489109664 is 46690198466.

It can be written as a sum of positive squares in 2 ways, for example, as 56387251600 + 10101858064 = 237460^2 + 100508^2 .

It is a super-2 number, since 2×66489109664² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66489109663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272207 + ... + 455054.

Almost surely, 2^66489109664 is an apocalyptic number.

It is an amenable number.

66489109664 is a deficient number, since it is larger than the sum of its proper divisors (64457322484).

66489109664 is a wasteful number, since it uses less digits than its factorization.

66489109664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730128 (or 730120 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 59.

The spelling of 66489109664 in words is "sixty-six billion, four hundred eighty-nine million, one hundred nine thousand, six hundred sixty-four".