66971228944 has 45 divisors (see below), whose sum is σ = 134141755431. Its totient is φ = 32389906080.

The previous prime is 66971228921. The next prime is 66971228957. The reversal of 66971228944 is 44982217966.

The square root of 66971228944 is 258788.

It is a perfect power (a square), and thus also a powerful number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 32088669 + ... + 32090755.

Almost surely, 2^66971228944 is an apocalyptic number.

66971228944 is the 258788-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66971228944

66971228944 is an abundant number, since it is smaller than the sum of its proper divisors (67170526487).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66971228944 is an frugal number, since it uses more digits than its factorization.

66971228944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4244 (or 2120 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 58.

The spelling of 66971228944 in words is "sixty-six billion, nine hundred seventy-one million, two hundred twenty-eight thousand, nine hundred forty-four".