217864380023 has 4 divisors (see below), whose sum is σ = 229330926360. Its totient is φ = 206397833688.

The previous prime is 217864380001. The next prime is 217864380029. The reversal of 217864380023 is 320083468712.

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

It is a cyclic number.

It is not a de Polignac number, because 217864380023 - 2⁶ = 217864379959 is a prime.

It is a super-2 number, since 2×217864380023² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217864380029) 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, 5733273140 + ... + 5733273177.

It is an arithmetic number, because the mean of its divisors is an integer number (57332731590).

Almost surely, 2^217864380023 is an apocalyptic number.

217864380023 is a deficient number, since it is larger than the sum of its proper divisors (11466546337).

217864380023 is a wasteful number, since it uses less digits than its factorization.

217864380023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11466546336.

The product of its (nonzero) digits is 387072, while the sum is 44.

The spelling of 217864380023 in words is "two hundred seventeen billion, eight hundred sixty-four million, three hundred eighty thousand, twenty-three".