66944121296 has 40 divisors (see below), whose sum is σ = 147898049544. Its totient is φ = 29079797760.

The previous prime is 66944121239. The next prime is 66944121301. The reversal of 66944121296 is 69212144966.

It can be written as a sum of positive squares in 4 ways, for example, as 2039425600 + 64904695696 = 45160^2 + 254764^2 .

It is a super-3 number, since 3×66944121296³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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, 9462545 + ... + 9469616.

Almost surely, 2^66944121296 is an apocalyptic number.

It is an amenable number.

66944121296 is an abundant number, since it is smaller than the sum of its proper divisors (80953928248).

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

66944121296 is a wasteful number, since it uses less digits than its factorization.

66944121296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18932199 (or 18932193 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 50.

The spelling of 66944121296 in words is "sixty-six billion, nine hundred forty-four million, one hundred twenty-one thousand, two hundred ninety-six".