66654843013 has 4 divisors (see below), whose sum is σ = 72714374208. Its totient is φ = 60595311820.

The previous prime is 66654843011. The next prime is 66654843043. The reversal of 66654843013 is 31034845666.

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 66654843013 - 2¹ = 66654843011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66654843011) 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, 3029765581 + ... + 3029765602.

It is an arithmetic number, because the mean of its divisors is an integer number (18178593552).

Almost surely, 2^66654843013 is an apocalyptic number.

It is an amenable number.

66654843013 is a deficient number, since it is larger than the sum of its proper divisors (6059531195).

66654843013 is a wasteful number, since it uses less digits than its factorization.

66654843013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6059531194.

The product of its (nonzero) digits is 1244160, while the sum is 46.

The spelling of 66654843013 in words is "sixty-six billion, six hundred fifty-four million, eight hundred forty-three thousand, thirteen".