66686450159 has 8 divisors (see below), whose sum is σ = 76219684128. Its totient is φ = 57154865760.

The previous prime is 66686450153. The next prime is 66686450189. The reversal of 66686450159 is 95105468666.

It is a happy number.

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 66686450159 - 2⁸ = 66686449903 is a prime.

It is a super-2 number, since 2×66686450159² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66686450153) 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, 324512 + ... + 488549.

It is an arithmetic number, because the mean of its divisors is an integer number (9527460516).

Almost surely, 2^66686450159 is an apocalyptic number.

66686450159 is a deficient number, since it is larger than the sum of its proper divisors (9533233969).

66686450159 is a wasteful number, since it uses less digits than its factorization.

66686450159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824785.

The product of its (nonzero) digits is 9331200, while the sum is 56.

The spelling of 66686450159 in words is "sixty-six billion, six hundred eighty-six million, four hundred fifty thousand, one hundred fifty-nine".