66188724373 has 4 divisors (see below), whose sum is σ = 66627060448. Its totient is φ = 65750388300.

The previous prime is 66188724353. The next prime is 66188724439. The reversal of 66188724373 is 37342788166.

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 66188724373 - 2¹⁷ = 66188593301 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 (66188724313) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 219167811 + ... + 219168112.

It is an arithmetic number, because the mean of its divisors is an integer number (16656765112).

Almost surely, 2^66188724373 is an apocalyptic number.

It is an amenable number.

66188724373 is a deficient number, since it is larger than the sum of its proper divisors (438336075).

66188724373 is a wasteful number, since it uses less digits than its factorization.

66188724373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438336074.

The product of its digits is 8128512, while the sum is 55.

The spelling of 66188724373 in words is "sixty-six billion, one hundred eighty-eight million, seven hundred twenty-four thousand, three hundred seventy-three".