817868420481 has 16 divisors (see below), whose sum is σ = 1246986683264. Its totient is φ = 467086760064.

The previous prime is 817868420477. The next prime is 817868420503. The reversal of 817868420481 is 184024868718.

It is a happy number.

817868420481 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 817868420481 - 2² = 817868420477 is a prime.

It is a super-2 number, since 2×817868420481² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (817868440481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11071606 + ... + 11145231.

It is an arithmetic number, because the mean of its divisors is an integer number (77936667704).

Almost surely, 2^817868420481 is an apocalyptic number.

It is an amenable number.

817868420481 is a deficient number, since it is larger than the sum of its proper divisors (429118262783).

817868420481 is a wasteful number, since it uses less digits than its factorization.

817868420481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22218600.

The product of its (nonzero) digits is 5505024, while the sum is 57.

The spelling of 817868420481 in words is "eight hundred seventeen billion, eight hundred sixty-eight million, four hundred twenty thousand, four hundred eighty-one".