189775939184681 has 2 divisors, whose sum is σ = 189775939184682. Its totient is φ = 189775939184680.

The previous prime is 189775939184639. The next prime is 189775939184749. The reversal of 189775939184681 is 186481939577981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108803674810000 + 80972264374681 = 10430900^2 + 8998459^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189775939184681 is a prime.

It is a super-2 number, since 2×189775939184681² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 189775939184593 and 189775939184602.

It is not a weakly prime, because it can be changed into another prime (189775939184081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94887969592340 + 94887969592341.

It is an arithmetic number, because the mean of its divisors is an integer number (94887969592341).

Almost surely, 2^{189775939184681} is an apocalyptic number.

It is an amenable number.

189775939184681 is a deficient number, since it is larger than the sum of its proper divisors (1).

189775939184681 is an equidigital number, since it uses as much as digits as its factorization.

189775939184681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6584094720, while the sum is 86.

The spelling of 189775939184681 in words is "one hundred eighty-nine trillion, seven hundred seventy-five billion, nine hundred thirty-nine million, one hundred eighty-four thousand, six hundred eighty-one".