66330061980 has 96 divisors (see below), whose sum is σ = 228583617024. Its totient is φ = 13994913024.

The previous prime is 66330061979. The next prime is 66330061991. The reversal of 66330061980 is 8916003366.

It is a Harshad number since it is a multiple of its sum of digits (42).

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 31 ways as a sum of consecutive naturals, for example, 6068722 + ... + 6079641.

It is an arithmetic number, because the mean of its divisors is an integer number (2381079344).

Almost surely, 2^66330061980 is an apocalyptic number.

66330061980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66330061980 is an abundant number, since it is smaller than the sum of its proper divisors (162253555044).

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

66330061980 is a wasteful number, since it uses less digits than its factorization.

66330061980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12148395 (or 12148393 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 42.

The spelling of 66330061980 in words is "sixty-six billion, three hundred thirty million, sixty-one thousand, nine hundred eighty".