1966566874799 has 4 divisors (see below), whose sum is σ = 1966710527880. Its totient is φ = 1966423221720.

The previous prime is 1966566874793. The next prime is 1966566874801. The reversal of 1966566874799 is 9974786656691.

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 1966566874799 - 2²⁴ = 1966550097583 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 (1966566874793) 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, 71806004 + ... + 71833385.

It is an arithmetic number, because the mean of its divisors is an integer number (491677631970).

Almost surely, 2^{1966566874799} is an apocalyptic number.

1966566874799 is a deficient number, since it is larger than the sum of its proper divisors (143653081).

1966566874799 is a wasteful number, since it uses less digits than its factorization.

1966566874799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143653080.

The product of its digits is 7407106560, while the sum is 83.

The spelling of 1966566874799 in words is "one trillion, nine hundred sixty-six billion, five hundred sixty-six million, eight hundred seventy-four thousand, seven hundred ninety-nine".