66326055506 has 4 divisors (see below), whose sum is σ = 99489083262. Its totient is φ = 33163027752.

The previous prime is 66326055493. The next prime is 66326055533. The reversal of 66326055506 is 60555062366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 46770550225 + 19555505281 = 216265^2 + 139841^2 .

It is a super-3 number, since 3×66326055506³ (a number of 33 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 16581513875 + ... + 16581513878.

Almost surely, 2^66326055506 is an apocalyptic number.

66326055506 is a deficient number, since it is larger than the sum of its proper divisors (33163027756).

66326055506 is a wasteful number, since it uses less digits than its factorization.

66326055506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33163027755.

The product of its (nonzero) digits is 972000, while the sum is 44.

The spelling of 66326055506 in words is "sixty-six billion, three hundred twenty-six million, fifty-five thousand, five hundred six".