684238332969 has 9 divisors (see below), whose sum is σ = 988347843223. Its totient is φ = 456157234272.

The previous prime is 684238332961. The next prime is 684238332983. The reversal of 684238332969 is 969233832486.

The square root of 684238332969 is 827187.

It is a perfect power (a square), and thus also a powerful number.

684238332969 is a `hidden beast` number, since 6 + 8 + 4 + 238 + 332 + 9 + 69 = 666.

684238332969 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 632363715369 + 51874617600 = 795213^2 + 227760^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 684238332969 - 2³ = 684238332961 is a prime.

It is a super-2 number, since 2×684238332969² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684238332961) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2343697 + ... + 2619425.

Almost surely, 2^684238332969 is an apocalyptic number.

684238332969 is the 827187-th square number.

684238332969 is the 413594-th centered octagonal number.

It is an amenable number.

684238332969 is a deficient number, since it is larger than the sum of its proper divisors (304109510254).

684238332969 is an frugal number, since it uses more digits than its factorization.

684238332969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551464 (or 275732 counting only the distinct ones).

The product of its digits is 80621568, while the sum is 63.

The spelling of 684238332969 in words is "six hundred eighty-four billion, two hundred thirty-eight million, three hundred thirty-two thousand, nine hundred sixty-nine".