20666294252819 has 4 divisors (see below), whose sum is σ = 20666303823744. Its totient is φ = 20666284681896.

The previous prime is 20666294252797. The next prime is 20666294252833. The reversal of 20666294252819 is 91825249266602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20666294252819 - 2³² = 20661999285523 is a prime.

It is a super-2 number, since 2×20666294252819² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20666294252839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150569 + ... + 6430805.

It is an arithmetic number, because the mean of its divisors is an integer number (5166575955936).

Almost surely, 2^{20666294252819} is an apocalyptic number.

20666294252819 is a deficient number, since it is larger than the sum of its proper divisors (9570925).

20666294252819 is an equidigital number, since it uses as much as digits as its factorization.

20666294252819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9570924.

The product of its (nonzero) digits is 44789760, while the sum is 62.

The spelling of 20666294252819 in words is "twenty trillion, six hundred sixty-six billion, two hundred ninety-four million, two hundred fifty-two thousand, eight hundred nineteen".