66188557329 has 4 divisors (see below), whose sum is σ = 88251409776. Its totient is φ = 44125704884.

The previous prime is 66188557321. The next prime is 66188557381. The reversal of 66188557329 is 92375588166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66188557329 - 2³ = 66188557321 is a prime.

It is a super-2 number, since 2×66188557329² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66188557321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11031426219 + ... + 11031426224.

It is an arithmetic number, because the mean of its divisors is an integer number (22062852444).

Almost surely, 2^66188557329 is an apocalyptic number.

It is an amenable number.

66188557329 is a deficient number, since it is larger than the sum of its proper divisors (22062852447).

66188557329 is a wasteful number, since it uses less digits than its factorization.

66188557329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22062852446.

The product of its digits is 21772800, while the sum is 60.

The spelling of 66188557329 in words is "sixty-six billion, one hundred eighty-eight million, five hundred fifty-seven thousand, three hundred twenty-nine".