866243354296321 has 16 divisors (see below), whose sum is σ = 874983370043520. Its totient is φ = 857506556332800.

The previous prime is 866243354296291. The next prime is 866243354296337. The reversal of 866243354296321 is 123692453342668.

It is a cyclic number.

It is not a de Polignac number, because 866243354296321 - 2²⁹ = 866242817425409 is a prime.

It is a super-3 number, since 3×866243354296321³ (a number of 46 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866243354296381) 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, 22460720580 + ... + 22460759146.

It is an arithmetic number, because the mean of its divisors is an integer number (54686460627720).

Almost surely, 2^{866243354296321} is an apocalyptic number.

It is an amenable number.

866243354296321 is a deficient number, since it is larger than the sum of its proper divisors (8740015747199).

866243354296321 is a wasteful number, since it uses less digits than its factorization.

866243354296321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74424.

The product of its digits is 268738560, while the sum is 64.

The spelling of 866243354296321 in words is "eight hundred sixty-six trillion, two hundred forty-three billion, three hundred fifty-four million, two hundred ninety-six thousand, three hundred twenty-one".