66381530669 has 16 divisors (see below), whose sum is σ = 69577804800. Its totient is φ = 63257863680.

The previous prime is 66381530617. The next prime is 66381530713. The reversal of 66381530669 is 96603518366.

It is a cyclic number.

It is not a de Polignac number, because 66381530669 - 2¹⁶ = 66381465133 is a prime.

It is a super-3 number, since 3×66381530669³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66381530669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66381532669) 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, 542927 + ... + 653859.

It is an arithmetic number, because the mean of its divisors is an integer number (4348612800).

Almost surely, 2^66381530669 is an apocalyptic number.

It is an amenable number.

66381530669 is a deficient number, since it is larger than the sum of its proper divisors (3196274131).

66381530669 is a wasteful number, since it uses less digits than its factorization.

66381530669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111260.

The product of its (nonzero) digits is 4199040, while the sum is 53.

The spelling of 66381530669 in words is "sixty-six billion, three hundred eighty-one million, five hundred thirty thousand, six hundred sixty-nine".