684332551871 has 4 divisors (see below), whose sum is σ = 684341101200. Its totient is φ = 684324002544.

The previous prime is 684332551843. The next prime is 684332551883. The reversal of 684332551871 is 178155233486.

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 684332551871 - 2¹⁴ = 684332535487 is a prime.

It is a super-2 number, since 2×684332551871² (a number of 24 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 (684332551811) 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, 4153451 + ... + 4315068.

It is an arithmetic number, because the mean of its divisors is an integer number (171085275300).

Almost surely, 2^684332551871 is an apocalyptic number.

684332551871 is a deficient number, since it is larger than the sum of its proper divisors (8549329).

684332551871 is an equidigital number, since it uses as much as digits as its factorization.

684332551871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8549328.

The product of its digits is 4838400, while the sum is 53.

The spelling of 684332551871 in words is "six hundred eighty-four billion, three hundred thirty-two million, five hundred fifty-one thousand, eight hundred seventy-one".