66644536234 has 16 divisors (see below), whose sum is σ = 102676848768. Its totient is φ = 32419064592.

The previous prime is 66644536199. The next prime is 66644536237. The reversal of 66644536234 is 43263544666.

It is a happy number.

It is a super-3 number, since 3×66644536234³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (66644536237) 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 7 ways as a sum of consecutive naturals, for example, 1156387 + ... + 1212649.

It is an arithmetic number, because the mean of its divisors is an integer number (6417303048).

Almost surely, 2^66644536234 is an apocalyptic number.

66644536234 is a deficient number, since it is larger than the sum of its proper divisors (36032312534).

66644536234 is a wasteful number, since it uses less digits than its factorization.

66644536234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72309.

The product of its digits is 7464960, while the sum is 49.

The spelling of 66644536234 in words is "sixty-six billion, six hundred forty-four million, five hundred thirty-six thousand, two hundred thirty-four".