189665545 has 4 divisors (see below), whose sum is σ = 227598660. Its totient is φ = 151732432.

The previous prime is 189665519. The next prime is 189665551. The reversal of 189665545 is 545566981.

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 43086096 + 146579449 = 6564^2 + 12107^2 .

It is a cyclic number.

It is not a de Polignac number, because 189665545 - 2¹³ = 189657353 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18966550 + ... + 18966559.

It is an arithmetic number, because the mean of its divisors is an integer number (56899665).

Almost surely, 2^189665545 is an apocalyptic number.

It is an amenable number.

189665545 is a deficient number, since it is larger than the sum of its proper divisors (37933115).

189665545 is an equidigital number, since it uses as much as digits as its factorization.

189665545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37933114.

The product of its digits is 1296000, while the sum is 49.

The square root of 189665545 is about 13771.9114504850. The cubic root of 189665545 is about 574.5521856709.

The spelling of 189665545 in words is "one hundred eighty-nine million, six hundred sixty-five thousand, five hundred forty-five".