189844865709 has 4 divisors (see below), whose sum is σ = 253126487616. Its totient is φ = 126563243804.

The previous prime is 189844865699. The next prime is 189844865723. The reversal of 189844865709 is 907568448981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 189844865709 - 2¹⁵ = 189844832941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189844865789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31640810949 + ... + 31640810954.

It is an arithmetic number, because the mean of its divisors is an integer number (63281621904).

Almost surely, 2^189844865709 is an apocalyptic number.

It is an amenable number.

189844865709 is a deficient number, since it is larger than the sum of its proper divisors (63281621907).

189844865709 is an equidigital number, since it uses as much as digits as its factorization.

189844865709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63281621906.

The product of its (nonzero) digits is 139345920, while the sum is 69.

The spelling of 189844865709 in words is "one hundred eighty-nine billion, eight hundred forty-four million, eight hundred sixty-five thousand, seven hundred nine".