189713779709 has 4 divisors (see below), whose sum is σ = 189716242620. Its totient is φ = 189711316800.

The previous prime is 189713779693. The next prime is 189713779729. The reversal of 189713779709 is 907977317981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45378372484 + 144335407225 = 213022^2 + 379915^2 .

It is a cyclic number.

It is not a de Polignac number, because 189713779709 - 2⁴ = 189713779693 is a prime.

It is a super-2 number, since 2×189713779709² (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 (189713779729) 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, 1112054 + ... + 1271255.

It is an arithmetic number, because the mean of its divisors is an integer number (47429060655).

Almost surely, 2^189713779709 is an apocalyptic number.

It is an amenable number.

189713779709 is a deficient number, since it is larger than the sum of its proper divisors (2462911).

189713779709 is an equidigital number, since it uses as much as digits as its factorization.

189713779709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2462910.

The product of its (nonzero) digits is 42007896, while the sum is 68.

The spelling of 189713779709 in words is "one hundred eighty-nine billion, seven hundred thirteen million, seven hundred seventy-nine thousand, seven hundred nine".