66150013821 has 8 divisors (see below), whose sum is σ = 88212705984. Its totient is φ = 44093665440.

The previous prime is 66150013819. The next prime is 66150013861. The reversal of 66150013821 is 12831005166.

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

It is not a de Polignac number, because 66150013821 - 2¹ = 66150013819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66150013861) 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, 1561560 + ... + 1603361.

It is an arithmetic number, because the mean of its divisors is an integer number (11026588248).

Almost surely, 2^66150013821 is an apocalyptic number.

It is an amenable number.

66150013821 is a deficient number, since it is larger than the sum of its proper divisors (22062692163).

66150013821 is a wasteful number, since it uses less digits than its factorization.

66150013821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3171891.

The product of its (nonzero) digits is 8640, while the sum is 33.

Adding to 66150013821 its reverse (12831005166), we get a palindrome (78981018987).

The spelling of 66150013821 in words is "sixty-six billion, one hundred fifty million, thirteen thousand, eight hundred twenty-one".