194218549681 has 8 divisors (see below), whose sum is σ = 209164015424. Its totient is φ = 179273880720.

The previous prime is 194218549619. The next prime is 194218549729. The reversal of 194218549681 is 186945812491.

194218549681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 194218549681 - 2¹⁷ = 194218418609 is a prime.

It is a super-2 number, since 2×194218549681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (194218549601) 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 7 ways as a sum of consecutive naturals, for example, 366610 + ... + 723076.

It is an arithmetic number, because the mean of its divisors is an integer number (26145501928).

Almost surely, 2^194218549681 is an apocalyptic number.

It is an amenable number.

194218549681 is a deficient number, since it is larger than the sum of its proper divisors (14945465743).

194218549681 is a wasteful number, since it uses less digits than its factorization.

194218549681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398391.

The product of its digits is 4976640, while the sum is 58.

The spelling of 194218549681 in words is "one hundred ninety-four billion, two hundred eighteen million, five hundred forty-nine thousand, six hundred eighty-one".