84216430378081 has 4 divisors (see below), whose sum is σ = 84831148848132. Its totient is φ = 83601711908032.

The previous prime is 84216430378061. The next prime is 84216430378123. The reversal of 84216430378081 is 18087303461248.

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

It can be written as a sum of positive squares in 2 ways, for example, as 55935306378081 + 28281124000000 = 7478991^2 + 5318000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84216430378081 is a prime.

It is a super-2 number, since 2×84216430378081² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84216430378001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307359234820 + ... + 307359235093.

It is an arithmetic number, because the mean of its divisors is an integer number (21207787212033).

Almost surely, 2^{84216430378081} is an apocalyptic number.

It is an amenable number.

84216430378081 is a deficient number, since it is larger than the sum of its proper divisors (614718470051).

84216430378081 is a wasteful number, since it uses less digits than its factorization.

84216430378081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614718470050.

The product of its (nonzero) digits is 6193152, while the sum is 55.

The spelling of 84216430378081 in words is "eighty-four trillion, two hundred sixteen billion, four hundred thirty million, three hundred seventy-eight thousand, eighty-one".