19863101894417 has 4 divisors (see below), whose sum is σ = 20399942486196. Its totient is φ = 19326261302640.

The previous prime is 19863101894411. The next prime is 19863101894429. The reversal of 19863101894417 is 71449810136891.

It is a Cunningham number, because it is equal to 4456804²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17773779082816 + 2089322811601 = 4215896^2 + 1445449^2 .

It is a cyclic number.

It is not a de Polignac number, because 19863101894417 - 2¹² = 19863101890321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19863101894417.

It is not an unprimeable number, because it can be changed into a prime (19863101894411) 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, 268420295834 + ... + 268420295907.

It is an arithmetic number, because the mean of its divisors is an integer number (5099985621549).

Almost surely, 2^{19863101894417} is an apocalyptic number.

It is an amenable number.

19863101894417 is a deficient number, since it is larger than the sum of its proper divisors (536840591779).

19863101894417 is an equidigital number, since it uses as much as digits as its factorization.

19863101894417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536840591778.

The product of its (nonzero) digits is 10450944, while the sum is 62.

The spelling of 19863101894417 in words is "nineteen trillion, eight hundred sixty-three billion, one hundred one million, eight hundred ninety-four thousand, four hundred seventeen".