66564344144452 has 144 divisors (see below), whose sum is σ = 163325515425408. Its totient is φ = 23347376532480.

The previous prime is 66564344144443. The next prime is 66564344144453. The reversal of 66564344144452 is 25444144346566.

It is a super-2 number, since 2×66564344144452² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66564344144453) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38637823 + ... + 40323814.

It is an arithmetic number, because the mean of its divisors is an integer number (1134204968232).

Almost surely, 2^{66564344144452} is an apocalyptic number.

It is an amenable number.

66564344144452 is an abundant number, since it is smaller than the sum of its proper divisors (96761171280956).

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

66564344144452 is a wasteful number, since it uses less digits than its factorization.

66564344144452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78961706 (or 78961697 counting only the distinct ones).

The product of its digits is 132710400, while the sum is 58.

The spelling of 66564344144452 in words is "sixty-six trillion, five hundred sixty-four billion, three hundred forty-four million, one hundred forty-four thousand, four hundred fifty-two".