84166716870 has 128 divisors (see below), whose sum is σ = 232052705280. Its totient is φ = 21966647904.

The previous prime is 84166716863. The next prime is 84166716877. The reversal of 84166716870 is 7861766148.

84166716870 is a `hidden beast` number, since 8 + 416 + 67 + 168 + 7 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (84166716863) and next prime (84166716877).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84166716877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 986949 + ... + 1068831.

It is an arithmetic number, because the mean of its divisors is an integer number (1812911760).

Almost surely, 2^84166716870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84166716870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116026352640).

84166716870 is an abundant number, since it is smaller than the sum of its proper divisors (147885988410).

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

84166716870 is an equidigital number, since it uses as much as digits as its factorization.

84166716870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81958 (or 81940 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 84166716870 in words is "eighty-four billion, one hundred sixty-six million, seven hundred sixteen thousand, eight hundred seventy".