189953359981 has 32 divisors (see below), whose sum is σ = 237742553088. Its totient is φ = 147443000640.

The previous prime is 189953359889. The next prime is 189953359991.

189953359981 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 189953359981 - 2³³ = 181363425389 is a prime.

It is a super-2 number, since 2×189953359981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 189953359981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189953359991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32674431 + ... + 32680243.

It is an arithmetic number, because the mean of its divisors is an integer number (7429454784).

Almost surely, 2^189953359981 is an apocalyptic number.

189953359981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

189953359981 is a deficient number, since it is larger than the sum of its proper divisors (47789193107).

189953359981 is a wasteful number, since it uses less digits than its factorization.

189953359981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7401.

The product of its digits is 94478400, while the sum is 70.

The spelling of 189953359981 in words is "one hundred eighty-nine billion, nine hundred fifty-three million, three hundred fifty-nine thousand, nine hundred eighty-one".