213832865817 has 32 divisors (see below), whose sum is σ = 318341712000. Its totient is φ = 141857386560.

The previous prime is 213832865767. The next prime is 213832865849. The reversal of 213832865817 is 718568238312.

213832865817 is a `hidden beast` number, since 2 + 1 + 38 + 3 + 28 + 6 + 581 + 7 = 666.

It is not a de Polignac number, because 213832865817 - 2⁷ = 213832865689 is a prime.

It is a super-2 number, since 2×213832865817² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213832865867) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13167859 + ... + 13184087.

It is an arithmetic number, because the mean of its divisors is an integer number (9948178500).

Almost surely, 2^213832865817 is an apocalyptic number.

213832865817 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

213832865817 is a deficient number, since it is larger than the sum of its proper divisors (104508846183).

213832865817 is a wasteful number, since it uses less digits than its factorization.

213832865817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18598 (or 18592 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 54.

The spelling of 213832865817 in words is "two hundred thirteen billion, eight hundred thirty-two million, eight hundred sixty-five thousand, eight hundred seventeen".