684661253231 has 4 divisors (see below), whose sum is σ = 695885208264. Its totient is φ = 673437298200.

The previous prime is 684661253197. The next prime is 684661253267. The reversal of 684661253231 is 132352166486.

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 684661253231 - 2¹⁰ = 684661252207 is a prime.

It is a super-2 number, since 2×684661253231² (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 (684661253291) 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, 5611977425 + ... + 5611977546.

It is an arithmetic number, because the mean of its divisors is an integer number (173971302066).

Almost surely, 2^684661253231 is an apocalyptic number.

684661253231 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

684661253231 is a deficient number, since it is larger than the sum of its proper divisors (11223955033).

684661253231 is a wasteful number, since it uses less digits than its factorization.

684661253231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11223955032.

The product of its digits is 1244160, while the sum is 47.

The spelling of 684661253231 in words is "six hundred eighty-four billion, six hundred sixty-one million, two hundred fifty-three thousand, two hundred thirty-one".