12420066564 has 36 divisors (see below), whose sum is σ = 31400708976. Its totient is φ = 4139291568.

The previous prime is 12420066557. The next prime is 12420066569. The reversal of 12420066564 is 46566002421.

12420066564 is a `hidden beast` number, since 12 + 4 + 20 + 0 + 66 + 564 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (12420066569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 200347 + ... + 254909.

It is an arithmetic number, because the mean of its divisors is an integer number (872241916).

Almost surely, 2^12420066564 is an apocalyptic number.

It is an amenable number.

12420066564 is an abundant number, since it is smaller than the sum of its proper divisors (18980642412).

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

12420066564 is a wasteful number, since it uses less digits than its factorization.

12420066564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60896 (or 60891 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

Adding to 12420066564 its reverse (46566002421), we get a palindrome (58986068985).

The spelling of 12420066564 in words is "twelve billion, four hundred twenty million, sixty-six thousand, five hundred sixty-four".