189455554981 has 64 divisors (see below), whose sum is σ = 250202603520. Its totient is φ = 138980136960.

The previous prime is 189455554979. The next prime is 189455554991.

189455554981 is nontrivially palindromic in base 10.

189455554981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 189455554981 - 2¹ = 189455554979 is a prime.

It is a super-2 number, since 2×189455554981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189455554991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 281508661 + ... + 281509333.

It is an arithmetic number, because the mean of its divisors is an integer number (3909415680).

Almost surely, 2^189455554981 is an apocalyptic number.

189455554981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

189455554981 is a deficient number, since it is larger than the sum of its proper divisors (60747048539).

189455554981 is a wasteful number, since it uses less digits than its factorization.

189455554981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634.

The product of its digits is 51840000, while the sum is 64.

The spelling of 189455554981 in words is "one hundred eighty-nine billion, four hundred fifty-five million, five hundred fifty-four thousand, nine hundred eighty-one".