8621717345281 has 4 divisors (see below), whose sum is σ = 8621874498564. Its totient is φ = 8621560192000.

The previous prime is 8621717345257. The next prime is 8621717345291. The reversal of 8621717345281 is 1825437171268.

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 3791432065600 + 4830285279681 = 1947160^2 + 2197791^2 .

It is a cyclic number.

It is not a de Polignac number, because 8621717345281 - 2¹³ = 8621717337089 is a prime.

It is a super-2 number, since 2×8621717345281² (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 (8621717345231) 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, 78494320 + ... + 78604081.

It is an arithmetic number, because the mean of its divisors is an integer number (2155468624641).

Almost surely, 2^{8621717345281} is an apocalyptic number.

It is an amenable number.

8621717345281 is a deficient number, since it is larger than the sum of its proper divisors (157153283).

8621717345281 is a wasteful number, since it uses less digits than its factorization.

8621717345281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157153282.

The product of its digits is 4515840, while the sum is 55.

The spelling of 8621717345281 in words is "eight trillion, six hundred twenty-one billion, seven hundred seventeen million, three hundred forty-five thousand, two hundred eighty-one".