84001684079 has 2 divisors, whose sum is σ = 84001684080. Its totient is φ = 84001684078.

The previous prime is 84001684021. The next prime is 84001684097. The reversal of 84001684079 is 97048610048.

Together with next prime (84001684097) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84001684079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84001684009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42000842039 + 42000842040.

It is an arithmetic number, because the mean of its divisors is an integer number (42000842040).

Almost surely, 2^84001684079 is an apocalyptic number.

84001684079 is a deficient number, since it is larger than the sum of its proper divisors (1).

84001684079 is an equidigital number, since it uses as much as digits as its factorization.

84001684079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 84001684079 in words is "eighty-four billion, one million, six hundred eighty-four thousand, seventy-nine".