66981751199 has 8 divisors (see below), whose sum is σ = 73074345600. Its totient is φ = 60889714200.

The previous prime is 66981751189. The next prime is 66981751201. The reversal of 66981751199 is 99115718966.

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 66981751199 - 2⁴ = 66981751183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66981751129) 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, 135494 + ... + 390284.

It is an arithmetic number, because the mean of its divisors is an integer number (9134293200).

Almost surely, 2^66981751199 is an apocalyptic number.

66981751199 is a deficient number, since it is larger than the sum of its proper divisors (6092594401).

66981751199 is a wasteful number, since it uses less digits than its factorization.

66981751199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278701.

The product of its digits is 7348320, while the sum is 62.

The spelling of 66981751199 in words is "sixty-six billion, nine hundred eighty-one million, seven hundred fifty-one thousand, one hundred ninety-nine".