84074381779 has 2 divisors, whose sum is σ = 84074381780. Its totient is φ = 84074381778.

The previous prime is 84074381767. The next prime is 84074381801. The reversal of 84074381779 is 97718347048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84074381779 - 2²⁵ = 84040827347 is a prime.

It is not a weakly prime, because it can be changed into another prime (84074381749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42037190889 + 42037190890.

It is an arithmetic number, because the mean of its divisors is an integer number (42037190890).

Almost surely, 2^84074381779 is an apocalyptic number.

84074381779 is a deficient number, since it is larger than the sum of its proper divisors (1).

84074381779 is an equidigital number, since it uses as much as digits as its factorization.

84074381779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9483264, while the sum is 58.

The spelling of 84074381779 in words is "eighty-four billion, seventy-four million, three hundred eighty-one thousand, seven hundred seventy-nine".