66843841238 has 16 divisors (see below), whose sum is σ = 100383900480. Its totient is φ = 33382566336.

The previous prime is 66843841193. The next prime is 66843841249. The reversal of 66843841238 is 83214834866.

It is a happy number.

It is a super-2 number, since 2×66843841238² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66843841238.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7926008 + ... + 7934436.

It is an arithmetic number, because the mean of its divisors is an integer number (6273993780).

Almost surely, 2^66843841238 is an apocalyptic number.

66843841238 is a deficient number, since it is larger than the sum of its proper divisors (33540059242).

66843841238 is a wasteful number, since it uses less digits than its factorization.

66843841238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12631.

The product of its digits is 5308416, while the sum is 53.

The spelling of 66843841238 in words is "sixty-six billion, eight hundred forty-three million, eight hundred forty-one thousand, two hundred thirty-eight".