997783666387799 has 8 divisors (see below), whose sum is σ = 1000350555934080. Its totient is φ = 995216786549856.

The previous prime is 997783666387691. The next prime is 997783666387847.

997783666387799 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997783666387799 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 (997783666387199) 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, 232631297 + ... + 236881589.

It is an arithmetic number, because the mean of its divisors is an integer number (125043819491760).

Almost surely, 2^{997783666387799} is an apocalyptic number.

997783666387799 is a deficient number, since it is larger than the sum of its proper divisors (2566889546281).

997783666387799 is a wasteful number, since it uses less digits than its factorization.

997783666387799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4854169.

The product of its digits is 1959920395776, while the sum is 104.

The spelling of 997783666387799 in words is "nine hundred ninety-seven trillion, seven hundred eighty-three billion, six hundred sixty-six million, three hundred eighty-seven thousand, seven hundred ninety-nine".