684142419919 has 4 divisors (see below), whose sum is σ = 781877051344. Its totient is φ = 586407788496.

The previous prime is 684142419893. The next prime is 684142419929. The reversal of 684142419919 is 919914241486.

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 684142419919 - 2²⁵ = 684108865487 is a prime.

It is a super-2 number, since 2×684142419919² (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 (684142419929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48867315702 + ... + 48867315715.

It is an arithmetic number, because the mean of its divisors is an integer number (195469262836).

Almost surely, 2^684142419919 is an apocalyptic number.

684142419919 is a deficient number, since it is larger than the sum of its proper divisors (97734631425).

684142419919 is an equidigital number, since it uses as much as digits as its factorization.

684142419919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97734631424.

The product of its digits is 4478976, while the sum is 58.

The spelling of 684142419919 in words is "six hundred eighty-four billion, one hundred forty-two million, four hundred nineteen thousand, nine hundred nineteen".