66551454569 has 8 divisors (see below), whose sum is σ = 71138777472. Its totient is φ = 62105280160.

The previous prime is 66551454551. The next prime is 66551454589. The reversal of 66551454569 is 96545415566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66551454569 - 2¹⁶ = 66551389033 is a prime.

It is a super-2 number, since 2×66551454569² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66551454539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35286149 + ... + 35288034.

It is an arithmetic number, because the mean of its divisors is an integer number (8892347184).

Almost surely, 2^66551454569 is an apocalyptic number.

It is an amenable number.

66551454569 is a deficient number, since it is larger than the sum of its proper divisors (4587322903).

66551454569 is a wasteful number, since it uses less digits than its factorization.

66551454569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70574247.

The product of its digits is 19440000, while the sum is 56.

The spelling of 66551454569 in words is "sixty-six billion, five hundred fifty-one million, four hundred fifty-four thousand, five hundred sixty-nine".