66564211357 has 12 divisors (see below), whose sum is σ = 80101902780. Its totient is φ = 55087622016.

The previous prime is 66564211349. The next prime is 66564211367. The reversal of 66564211357 is 75311246566.

It can be written as a sum of positive squares in 2 ways, for example, as 49168184121 + 17396027236 = 221739^2 + 131894^2 .

It is not a de Polignac number, because 66564211357 - 2³ = 66564211349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66564211367) 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, 23420188 + ... + 23423029.

It is an arithmetic number, because the mean of its divisors is an integer number (6675158565).

Almost surely, 2^66564211357 is an apocalyptic number.

It is an amenable number.

66564211357 is a deficient number, since it is larger than the sum of its proper divisors (13537691423).

66564211357 is a wasteful number, since it uses less digits than its factorization.

66564211357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46843260 (or 46843253 counting only the distinct ones).

The product of its digits is 907200, while the sum is 46.

The spelling of 66564211357 in words is "sixty-six billion, five hundred sixty-four million, two hundred eleven thousand, three hundred fifty-seven".