6642684973 has 4 divisors (see below), whose sum is σ = 6642885280. Its totient is φ = 6642484668.

The previous prime is 6642684949. The next prime is 6642685013. The reversal of 6642684973 is 3794862466.

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 a de Polignac number, because none of the positive numbers 2^k-6642684973 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 (6642687973) 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, 37233 + ... + 121126.

It is an arithmetic number, because the mean of its divisors is an integer number (1660721320).

Almost surely, 2^6642684973 is an apocalyptic number.

It is an amenable number.

6642684973 is a deficient number, since it is larger than the sum of its proper divisors (200307).

6642684973 is a wasteful number, since it uses less digits than its factorization.

6642684973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200306.

The product of its digits is 10450944, while the sum is 55.

The square root of 6642684973 is about 81502.6685023257. The cubic root of 6642684973 is about 1879.8125825128.

The spelling of 6642684973 in words is "six billion, six hundred forty-two million, six hundred eighty-four thousand, nine hundred seventy-three".