66583206780 has 192 divisors, whose sum is σ = 196187443200. Its totient is φ = 16850534400.

The previous prime is 66583206769. The next prime is 66583206787. The reversal of 66583206780 is 8760238566.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66583206787) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 50942887 + ... + 50944193.

It is an arithmetic number, because the mean of its divisors is an integer number (1021809600).

Almost surely, 2^66583206780 is an apocalyptic number.

66583206780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66583206780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98093721600).

66583206780 is an abundant number, since it is smaller than the sum of its proper divisors (129604236420).

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

66583206780 is a wasteful number, since it uses less digits than its factorization.

66583206780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860 (or 1858 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 51.

The spelling of 66583206780 in words is "sixty-six billion, five hundred eighty-three million, two hundred six thousand, seven hundred eighty".