189477665 has 16 divisors (see below), whose sum is σ = 259268688. Its totient is φ = 131690496.

The previous prime is 189477661. The next prime is 189477689. The reversal of 189477665 is 566774981.

It can be written as a sum of positive squares in 8 ways, for example, as 18809569 + 170668096 = 4337^2 + 13064^2 .

It is a cyclic number.

It is not a de Polignac number, because 189477665 - 2² = 189477661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189477661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84632 + ... + 86841.

It is an arithmetic number, because the mean of its divisors is an integer number (16204293).

Almost surely, 2^189477665 is an apocalyptic number.

It is an amenable number.

189477665 is a deficient number, since it is larger than the sum of its proper divisors (69791023).

189477665 is a wasteful number, since it uses less digits than its factorization.

189477665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171508.

The product of its digits is 2540160, while the sum is 53.

The square root of 189477665 is about 13765.0886302995. The cubic root of 189477665 is about 574.3624085770.

The spelling of 189477665 in words is "one hundred eighty-nine million, four hundred seventy-seven thousand, six hundred sixty-five".