189563406665 has 4 divisors (see below), whose sum is σ = 227476088004. Its totient is φ = 151650725328.

The previous prime is 189563406611. The next prime is 189563406709. The reversal of 189563406665 is 566604365981.

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 81434895424 + 108128511241 = 285368^2 + 328829^2 .

It is a cyclic number.

It is not a de Polignac number, because 189563406665 - 2¹⁸ = 189563144521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18956340662 + ... + 18956340671.

It is an arithmetic number, because the mean of its divisors is an integer number (56869022001).

Almost surely, 2^189563406665 is an apocalyptic number.

It is an amenable number.

189563406665 is a deficient number, since it is larger than the sum of its proper divisors (37912681339).

189563406665 is an equidigital number, since it uses as much as digits as its factorization.

189563406665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37912681338.

The product of its (nonzero) digits is 27993600, while the sum is 59.

The spelling of 189563406665 in words is "one hundred eighty-nine billion, five hundred sixty-three million, four hundred six thousand, six hundred sixty-five".