189188105655581 has 16 divisors (see below), whose sum is σ = 194870765280000. Its totient is φ = 183588965816256.

The previous prime is 189188105655569. The next prime is 189188105655611. The reversal of 189188105655581 is 185556501881981.

It is a cyclic number.

It is not a de Polignac number, because 189188105655581 - 2⁴⁶ = 118819361477917 is a prime.

It is a super-2 number, since 2×189188105655581² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189188105657581) 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, 18083735 + ... + 26559323.

It is an arithmetic number, because the mean of its divisors is an integer number (12179422830000).

Almost surely, 2^{189188105655581} is an apocalyptic number.

It is an amenable number.

189188105655581 is a deficient number, since it is larger than the sum of its proper divisors (5682659624419).

189188105655581 is an equidigital number, since it uses as much as digits as its factorization.

189188105655581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8480516.

The product of its (nonzero) digits is 138240000, while the sum is 71.

The spelling of 189188105655581 in words is "one hundred eighty-nine trillion, one hundred eighty-eight billion, one hundred five million, six hundred fifty-five thousand, five hundred eighty-one".