66679181780 has 48 divisors (see below), whose sum is σ = 153804631680. Its totient is φ = 24169292928.

The previous prime is 66679181773. The next prime is 66679181783. The reversal of 66679181780 is 8718197666.

66679181780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66679181780² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66679181783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3805859 + ... + 3823338.

It is an arithmetic number, because the mean of its divisors is an integer number (3204263160).

Almost surely, 2^66679181780 is an apocalyptic number.

It is an amenable number.

66679181780 is an abundant number, since it is smaller than the sum of its proper divisors (87125449900).

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

66679181780 is a wasteful number, since it uses less digits than its factorization.

66679181780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7629248 (or 7629246 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 59.

The spelling of 66679181780 in words is "sixty-six billion, six hundred seventy-nine million, one hundred eighty-one thousand, seven hundred eighty".