84345444479 has 2 divisors, whose sum is σ = 84345444480. Its totient is φ = 84345444478.

The previous prime is 84345444439. The next prime is 84345444527. The reversal of 84345444479 is 97444454348.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84345444479 is a prime.

It is a super-2 number, since 2×84345444479² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84345444439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42172722239 + 42172722240.

It is an arithmetic number, because the mean of its divisors is an integer number (42172722240).

Almost surely, 2^84345444479 is an apocalyptic number.

84345444479 is a deficient number, since it is larger than the sum of its proper divisors (1).

84345444479 is an equidigital number, since it uses as much as digits as its factorization.

84345444479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30965760, while the sum is 56.

The spelling of 84345444479 in words is "eighty-four billion, three hundred forty-five million, four hundred forty-four thousand, four hundred seventy-nine".