189665045985 has 16 divisors (see below), whose sum is σ = 303474303936. Its totient is φ = 101151281088.

The previous prime is 189665045963. The next prime is 189665046001. The reversal of 189665045985 is 589540566981.

It is not a de Polignac number, because 189665045985 - 2¹² = 189665041889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284062 + ... + 678248.

It is an arithmetic number, because the mean of its divisors is an integer number (18967143996).

Almost surely, 2^189665045985 is an apocalyptic number.

189665045985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

189665045985 is a deficient number, since it is larger than the sum of its proper divisors (113809257951).

189665045985 is a wasteful number, since it uses less digits than its factorization.

189665045985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426272.

The product of its (nonzero) digits is 93312000, while the sum is 66.

The spelling of 189665045985 in words is "one hundred eighty-nine billion, six hundred sixty-five million, forty-five thousand, nine hundred eighty-five".