66434541220 has 12 divisors (see below), whose sum is σ = 139512536604. Its totient is φ = 26573816480.

The previous prime is 66434541211. The next prime is 66434541223. The reversal of 66434541220 is 2214543466.

It can be written as a sum of positive squares in 2 ways, for example, as 9574231104 + 56860310116 = 97848^2 + 238454^2 .

It is a super-2 number, since 2×66434541220² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66434541220.

It is not an unprimeable number, because it can be changed into a prime (66434541223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1660863511 + ... + 1660863550.

It is an arithmetic number, because the mean of its divisors is an integer number (11626044717).

Almost surely, 2^66434541220 is an apocalyptic number.

It is an amenable number.

66434541220 is an abundant number, since it is smaller than the sum of its proper divisors (73077995384).

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

66434541220 is a wasteful number, since it uses less digits than its factorization.

66434541220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3321727070 (or 3321727068 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 37.

The spelling of 66434541220 in words is "sixty-six billion, four hundred thirty-four million, five hundred forty-one thousand, two hundred twenty".