66881830019 has 4 divisors (see below), whose sum is σ = 69789735696. Its totient is φ = 63973924344.

The previous prime is 66881830009. The next prime is 66881830031. The reversal of 66881830019 is 91003818866.

It is a happy number.

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 66881830019 - 2²⁸ = 66613394563 is a prime.

It is a super-2 number, since 2×66881830019² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66881830009) 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, 1453952804 + ... + 1453952849.

It is an arithmetic number, because the mean of its divisors is an integer number (17447433924).

Almost surely, 2^66881830019 is an apocalyptic number.

66881830019 is a deficient number, since it is larger than the sum of its proper divisors (2907905677).

66881830019 is a wasteful number, since it uses less digits than its factorization.

66881830019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2907905676.

The product of its (nonzero) digits is 497664, while the sum is 50.

The spelling of 66881830019 in words is "sixty-six billion, eight hundred eighty-one million, eight hundred thirty thousand, nineteen".