66943091020 has 48 divisors (see below), whose sum is σ = 159362511840. Its totient is φ = 23416528896.

The previous prime is 66943090961. The next prime is 66943091029. The reversal of 66943091020 is 2019034966.

It is not an unprimeable number, because it can be changed into a prime (66943091029) 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 15 ways as a sum of consecutive naturals, for example, 6770677 + ... + 6780556.

It is an arithmetic number, because the mean of its divisors is an integer number (3320052330).

Almost surely, 2^66943091020 is an apocalyptic number.

It is an amenable number.

66943091020 is an abundant number, since it is smaller than the sum of its proper divisors (92419420820).

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

66943091020 is a wasteful number, since it uses less digits than its factorization.

66943091020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13551274 (or 13551272 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 40.

The spelling of 66943091020 in words is "sixty-six billion, nine hundred forty-three million, ninety-one thousand, twenty".