66536663566 has 8 divisors (see below), whose sum is σ = 103024511424. Its totient is φ = 32195159760.

The previous prime is 66536663551. The next prime is 66536663569.

It is a happy number.

66536663566 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66536663566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66536663569) 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, 536585935 + ... + 536586058.

It is an arithmetic number, because the mean of its divisors is an integer number (12878063928).

Almost surely, 2^66536663566 is an apocalyptic number.

66536663566 is a deficient number, since it is larger than the sum of its proper divisors (36487847858).

66536663566 is a wasteful number, since it uses less digits than its factorization.

66536663566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073172026.

The product of its digits is 62985600, while the sum is 58.

The spelling of 66536663566 in words is "sixty-six billion, five hundred thirty-six million, six hundred sixty-three thousand, five hundred sixty-six".