66722227780 has 24 divisors (see below), whose sum is σ = 150894884952. Its totient is φ = 24635899392.

The previous prime is 66722227771. The next prime is 66722227787. The reversal of 66722227780 is 8772222766.

It can be written as a sum of positive squares in 4 ways, for example, as 9780814404 + 56941413376 = 98898^2 + 238624^2 .

It is not an unprimeable number, because it can be changed into a prime (66722227787) 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 7 ways as a sum of consecutive naturals, for example, 128311717 + ... + 128312236.

It is an arithmetic number, because the mean of its divisors is an integer number (6287286873).

Almost surely, 2^66722227780 is an apocalyptic number.

It is an amenable number.

66722227780 is an abundant number, since it is smaller than the sum of its proper divisors (84172657172).

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

66722227780 is a wasteful number, since it uses less digits than its factorization.

66722227780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256623975 (or 256623973 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 49.

The spelling of 66722227780 in words is "sixty-six billion, seven hundred twenty-two million, two hundred twenty-seven thousand, seven hundred eighty".