189842441777 has 2 divisors, whose sum is σ = 189842441778. Its totient is φ = 189842441776.

The previous prime is 189842441753. The next prime is 189842441843. The reversal of 189842441777 is 777144248981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120686065201 + 69156376576 = 347399^2 + 262976^2 .

It is an emirp because it is prime and its reverse (777144248981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189842441777 - 2²⁰ = 189841393201 is a prime.

It is not a weakly prime, because it can be changed into another prime (189842441707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94921220888 + 94921220889.

It is an arithmetic number, because the mean of its divisors is an integer number (94921220889).

Almost surely, 2^189842441777 is an apocalyptic number.

It is an amenable number.

189842441777 is a deficient number, since it is larger than the sum of its proper divisors (1).

189842441777 is an equidigital number, since it uses as much as digits as its factorization.

189842441777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25288704, while the sum is 62.

The spelling of 189842441777 in words is "one hundred eighty-nine billion, eight hundred forty-two million, four hundred forty-one thousand, seven hundred seventy-seven".