84165393780 has 144 divisors (see below), whose sum is σ = 276948204624. Its totient is φ = 20566333440.

The previous prime is 84165393761. The next prime is 84165393821. The reversal of 84165393780 is 8739356148.

84165393780 is a `hidden beast` number, since 84 + 165 + 39 + 378 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 9803376144 + 74362017636 = 99012^2 + 272694^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 189310 + ... + 451850.

It is an arithmetic number, because the mean of its divisors is an integer number (1923251421).

Almost surely, 2^84165393780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84165393780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138474102312).

84165393780 is an abundant number, since it is smaller than the sum of its proper divisors (192782810844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84165393780 is a wasteful number, since it uses less digits than its factorization.

84165393780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262706 (or 262701 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 84165393780 in words is "eighty-four billion, one hundred sixty-five million, three hundred ninety-three thousand, seven hundred eighty".