84117817078234 has 4 divisors (see below), whose sum is σ = 126176725617354. Its totient is φ = 42058908539116.

The previous prime is 84117817078231. The next prime is 84117817078247. The reversal of 84117817078234 is 43287071871148.

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., 75904119016209 + 8213698062025 = 8712297^2 + 2865955^2 .

It is not an unprimeable number, because it can be changed into a prime (84117817078231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21029454269557 + ... + 21029454269560.

Almost surely, 2^{84117817078234} is an apocalyptic number.

84117817078234 is a deficient number, since it is larger than the sum of its proper divisors (42058908539120).

84117817078234 is a wasteful number, since it uses less digits than its factorization.

84117817078234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42058908539119.

The product of its (nonzero) digits is 16859136, while the sum is 61.

The spelling of 84117817078234 in words is "eighty-four trillion, one hundred seventeen billion, eight hundred seventeen million, seventy-eight thousand, two hundred thirty-four".