66031809120 has 144 divisors (see below), whose sum is σ = 233679373200. Its totient is φ = 17608472064.

The previous prime is 66031809113. The next prime is 66031809121. The reversal of 66031809120 is 2190813066.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66031809121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 810295 + ... + 888054.

It is an arithmetic number, because the mean of its divisors is an integer number (1622773425).

Almost surely, 2^66031809120 is an apocalyptic number.

66031809120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66031809120 is an abundant number, since it is smaller than the sum of its proper divisors (167647564080).

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

66031809120 is a wasteful number, since it uses less digits than its factorization.

66031809120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1698379 (or 1698359 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 66031809120 in words is "sixty-six billion, thirty-one million, eight hundred nine thousand, one hundred twenty".