84819790809178 has 4 divisors (see below), whose sum is σ = 127229686213770. Its totient is φ = 42409895404588.

The previous prime is 84819790809157. The next prime is 84819790809191. The reversal of 84819790809178 is 87190809791848.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 80586044242729 + 4233746566449 = 8976973^2 + 2057607^2 .

It is a junction number, because it is equal to n+sod(n) for n = 84819790809098 and 84819790809107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21204947702293 + ... + 21204947702296.

Almost surely, 2^{84819790809178} is an apocalyptic number.

84819790809178 is a deficient number, since it is larger than the sum of its proper divisors (42409895404592).

84819790809178 is a wasteful number, since it uses less digits than its factorization.

84819790809178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42409895404591.

The product of its (nonzero) digits is 585252864, while the sum is 79.

The spelling of 84819790809178 in words is "eighty-four trillion, eight hundred nineteen billion, seven hundred ninety million, eight hundred nine thousand, one hundred seventy-eight".