20866311496798 has 4 divisors (see below), whose sum is σ = 31299467245200. Its totient is φ = 10433155748398.

The previous prime is 20866311496769. The next prime is 20866311496813. The reversal of 20866311496798 is 89769411366802.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5216577874198 + ... + 5216577874201.

It is an arithmetic number, because the mean of its divisors is an integer number (7824866811300).

Almost surely, 2^{20866311496798} is an apocalyptic number.

20866311496798 is a deficient number, since it is larger than the sum of its proper divisors (10433155748402).

20866311496798 is a wasteful number, since it uses less digits than its factorization.

20866311496798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10433155748401.

The product of its (nonzero) digits is 188116992, while the sum is 70.

The spelling of 20866311496798 in words is "twenty trillion, eight hundred sixty-six billion, three hundred eleven million, four hundred ninety-six thousand, seven hundred ninety-eight".