1979359109765 has 4 divisors (see below), whose sum is σ = 2375230931724. Its totient is φ = 1583487287808.

The previous prime is 1979359109747. The next prime is 1979359109779. The reversal of 1979359109765 is 5679019539791.

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 1530547545409 + 448811564356 = 1237153^2 + 669934^2 .

It is a cyclic number.

It is not a de Polignac number, because 1979359109765 - 2²⁶ = 1979292000901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197935910972 + ... + 197935910981.

It is an arithmetic number, because the mean of its divisors is an integer number (593807732931).

Almost surely, 2^{1979359109765} is an apocalyptic number.

It is an amenable number.

1979359109765 is a deficient number, since it is larger than the sum of its proper divisors (395871821959).

1979359109765 is an equidigital number, since it uses as much as digits as its factorization.

1979359109765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395871821958.

The product of its (nonzero) digits is 144670050, while the sum is 71.

The spelling of 1979359109765 in words is "one trillion, nine hundred seventy-nine billion, three hundred fifty-nine million, one hundred nine thousand, seven hundred sixty-five".