189655555209 has 16 divisors (see below), whose sum is σ = 260343484800. Its totient is φ = 122733325440.

The previous prime is 189655555189. The next prime is 189655555231. The reversal of 189655555209 is 902555556981.

It is a happy number.

It is not a de Polignac number, because 189655555209 - 2⁸ = 189655554953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (189655555279) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3849682 + ... + 3898635.

It is an arithmetic number, because the mean of its divisors is an integer number (16271467800).

Almost surely, 2^189655555209 is an apocalyptic number.

It is an amenable number.

189655555209 is a deficient number, since it is larger than the sum of its proper divisors (70687929591).

189655555209 is a wasteful number, since it uses less digits than its factorization.

189655555209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7748560.

The product of its (nonzero) digits is 24300000, while the sum is 60.

The spelling of 189655555209 in words is "one hundred eighty-nine billion, six hundred fifty-five million, five hundred fifty-five thousand, two hundred nine".