866124217818001 has 4 divisors (see below), whose sum is σ = 866167959276004. Its totient is φ = 866080476360000.

The previous prime is 866124217817983. The next prime is 866124217818059. The reversal of 866124217818001 is 100818712421668.

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 32664928424976 + 833459289393025 = 5715324^2 + 28869695^2 .

It is a cyclic number.

It is not a de Polignac number, because 866124217818001 - 2⁹ = 866124217817489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866124217888001) 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, 21870699300 + ... + 21870738901.

It is an arithmetic number, because the mean of its divisors is an integer number (216541989819001).

Almost surely, 2^{866124217818001} is an apocalyptic number.

It is an amenable number.

866124217818001 is a deficient number, since it is larger than the sum of its proper divisors (43741458003).

866124217818001 is a wasteful number, since it uses less digits than its factorization.

866124217818001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43741458002.

The product of its (nonzero) digits is 2064384, while the sum is 55.

The spelling of 866124217818001 in words is "eight hundred sixty-six trillion, one hundred twenty-four billion, two hundred seventeen million, eight hundred eighteen thousand, one".