186730195681 has 4 divisors (see below), whose sum is σ = 186731453700. Its totient is φ = 186728937664.

The previous prime is 186730195637. The next prime is 186730195693. The reversal of 186730195681 is 186591037681.

It is a happy number.

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 101442250000 + 85287945681 = 318500^2 + 292041^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-186730195681 is a prime.

It is a super-2 number, since 2×186730195681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (186730195621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371116 + ... + 714973.

It is an arithmetic number, because the mean of its divisors is an integer number (46682863425).

Almost surely, 2^186730195681 is an apocalyptic number.

It is an amenable number.

186730195681 is a deficient number, since it is larger than the sum of its proper divisors (1258019).

186730195681 is a wasteful number, since it uses less digits than its factorization.

186730195681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258018.

The product of its (nonzero) digits is 2177280, while the sum is 55.

The spelling of 186730195681 in words is "one hundred eighty-six billion, seven hundred thirty million, one hundred ninety-five thousand, six hundred eighty-one".