66608621563 has 8 divisors (see below), whose sum is σ = 72667172160. Its totient is φ = 60550607880.

The previous prime is 66608621561. The next prime is 66608621591. The reversal of 66608621563 is 36512680666.

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

It is a cyclic number.

It is not a de Polignac number, because 66608621563 - 2¹ = 66608621561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66608621561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151656 + ... + 395242.

It is an arithmetic number, because the mean of its divisors is an integer number (9083396520).

Almost surely, 2^66608621563 is an apocalyptic number.

66608621563 is a deficient number, since it is larger than the sum of its proper divisors (6058550597).

66608621563 is a wasteful number, since it uses less digits than its factorization.

66608621563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268457.

The product of its (nonzero) digits is 1866240, while the sum is 49.

The spelling of 66608621563 in words is "sixty-six billion, six hundred eight million, six hundred twenty-one thousand, five hundred sixty-three".