66680554159 has 4 divisors (see below), whose sum is σ = 67029667200. Its totient is φ = 66331441120.

The previous prime is 66680554151. The next prime is 66680554181. The reversal of 66680554159 is 95145508666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66680554159 - 2³ = 66680554151 is a prime.

It is a super-3 number, since 3×66680554159³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66680554151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174556234 + ... + 174556615.

It is an arithmetic number, because the mean of its divisors is an integer number (16757416800).

Almost surely, 2^66680554159 is an apocalyptic number.

66680554159 is a deficient number, since it is larger than the sum of its proper divisors (349113041).

66680554159 is a wasteful number, since it uses less digits than its factorization.

66680554159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349113040.

The product of its (nonzero) digits is 7776000, while the sum is 55.

The spelling of 66680554159 in words is "sixty-six billion, six hundred eighty million, five hundred fifty-four thousand, one hundred fifty-nine".