84216430378061 has 2 divisors, whose sum is σ = 84216430378062. Its totient is φ = 84216430378060.

The previous prime is 84216430378001. The next prime is 84216430378123. The reversal of 84216430378061 is 16087303461248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79995028672036 + 4221401706025 = 8943994^2 + 2054605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84216430378061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 84216430377994 and 84216430378012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84216430378001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42108215189030 + 42108215189031.

It is an arithmetic number, because the mean of its divisors is an integer number (42108215189031).

Almost surely, 2^{84216430378061} is an apocalyptic number.

It is an amenable number.

84216430378061 is a deficient number, since it is larger than the sum of its proper divisors (1).

84216430378061 is an equidigital number, since it uses as much as digits as its factorization.

84216430378061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4644864, while the sum is 53.

The spelling of 84216430378061 in words is "eighty-four trillion, two hundred sixteen billion, four hundred thirty million, three hundred seventy-eight thousand, sixty-one".