66733946128 has 20 divisors (see below), whose sum is σ = 129301872588. Its totient is φ = 33365720960.

The previous prime is 66733946119. The next prime is 66733946129. The reversal of 66733946128 is 82164933766.

It can be written as a sum of positive squares in 2 ways, for example, as 9503910144 + 57230035984 = 97488^2 + 239228^2 .

It is not an unprimeable number, because it can be changed into a prime (66733946129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 483750 + ... + 606202.

Almost surely, 2^66733946128 is an apocalyptic number.

It is an amenable number.

66733946128 is a deficient number, since it is larger than the sum of its proper divisors (62567926460).

66733946128 is a wasteful number, since it uses less digits than its factorization.

66733946128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156522 (or 156516 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 55.

The spelling of 66733946128 in words is "sixty-six billion, seven hundred thirty-three million, nine hundred forty-six thousand, one hundred twenty-eight".