66331928291 has 8 divisors (see below), whose sum is σ = 66609326784. Its totient is φ = 66054928680.

The previous prime is 66331928287. The next prime is 66331928293. The reversal of 66331928291 is 19282913366.

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 66331928291 - 2² = 66331928287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66331928293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235916 + ... + 433958.

It is an arithmetic number, because the mean of its divisors is an integer number (8326165848).

Almost surely, 2^66331928291 is an apocalyptic number.

66331928291 is a deficient number, since it is larger than the sum of its proper divisors (277398493).

66331928291 is a wasteful number, since it uses less digits than its factorization.

66331928291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199441.

The product of its digits is 839808, while the sum is 50.

The spelling of 66331928291 in words is "sixty-six billion, three hundred thirty-one million, nine hundred twenty-eight thousand, two hundred ninety-one".