66532120069 has 8 divisors (see below), whose sum is σ = 66628278360. Its totient is φ = 66436032000.

The previous prime is 66532120063. The next prime is 66532120093. The reversal of 66532120069 is 96002123566.

It can be written as a sum of positive squares in 4 ways, for example, as 127983969 + 66404136100 = 11313^2 + 257690^2 .

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 66532120069 - 2¹⁵ = 66532087301 is a prime.

It is a super-2 number, since 2×66532120069² (a number of 22 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 (66532120063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2050827 + ... + 2083015.

It is an arithmetic number, because the mean of its divisors is an integer number (8328534795).

Almost surely, 2^66532120069 is an apocalyptic number.

It is an amenable number.

66532120069 is a deficient number, since it is larger than the sum of its proper divisors (96158291).

66532120069 is a wasteful number, since it uses less digits than its factorization.

66532120069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35111.

The product of its (nonzero) digits is 116640, while the sum is 40.

The spelling of 66532120069 in words is "sixty-six billion, five hundred thirty-two million, one hundred twenty thousand, sixty-nine".