189934366781 has 8 divisors (see below), whose sum is σ = 198201173184. Its totient is φ = 181668292960.

The previous prime is 189934366777. The next prime is 189934366849. The reversal of 189934366781 is 187663439981.

189934366781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189934366781 - 2² = 189934366777 is a prime.

It is a super-2 number, since 2×189934366781² (a number of 23 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 (189934366711) 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 7 ways as a sum of consecutive naturals, for example, 384086 + ... + 726216.

It is an arithmetic number, because the mean of its divisors is an integer number (24775146648).

Almost surely, 2^189934366781 is an apocalyptic number.

It is an amenable number.

189934366781 is a deficient number, since it is larger than the sum of its proper divisors (8266806403).

189934366781 is a wasteful number, since it uses less digits than its factorization.

189934366781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366291.

The product of its digits is 47029248, while the sum is 65.

The spelling of 189934366781 in words is "one hundred eighty-nine billion, nine hundred thirty-four million, three hundred sixty-six thousand, seven hundred eighty-one".