66500022511 has 4 divisors (see below), whose sum is σ = 71615408872. Its totient is φ = 61384636152.

The previous prime is 66500022509. The next prime is 66500022551. The reversal of 66500022511 is 11522000566.

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

It is a cyclic number.

It is not a de Polignac number, because 66500022511 - 2¹ = 66500022509 is a prime.

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 66500022511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66500022551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2557693161 + ... + 2557693186.

It is an arithmetic number, because the mean of its divisors is an integer number (17903852218).

Almost surely, 2^66500022511 is an apocalyptic number.

66500022511 is a deficient number, since it is larger than the sum of its proper divisors (5115386361).

66500022511 is a wasteful number, since it uses less digits than its factorization.

66500022511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5115386360.

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 66500022511 in words is "sixty-six billion, five hundred million, twenty-two thousand, five hundred eleven".