66681671452 has 48 divisors (see below), whose sum is σ = 127830447360. Its totient is φ = 30184156800.

The previous prime is 66681671443. The next prime is 66681671453. The reversal of 66681671452 is 25417618666.

66681671452 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 66681671452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66681671453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11335552 + ... + 11341432.

It is an arithmetic number, because the mean of its divisors is an integer number (2663134320).

Almost surely, 2^66681671452 is an apocalyptic number.

It is an amenable number.

66681671452 is a deficient number, since it is larger than the sum of its proper divisors (61148775908).

66681671452 is a wasteful number, since it uses less digits than its factorization.

66681671452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6922 (or 6920 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 52.

The spelling of 66681671452 in words is "sixty-six billion, six hundred eighty-one million, six hundred seventy-one thousand, four hundred fifty-two".