879505985693 has 4 divisors (see below), whose sum is σ = 893924116668. Its totient is φ = 865087854720.

The previous prime is 879505985651. The next prime is 879505985717. The reversal of 879505985693 is 396589505978.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 396589505978 = 2 ⋅198294752989.

It can be written as a sum of positive squares in 2 ways, for example, as 297126378649 + 582379607044 = 545093^2 + 763138^2 .

It is a cyclic number.

It is not a de Polignac number, because 879505985693 - 2⁶ = 879505985629 is a prime.

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 879505985693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (879505988693) 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, 7209065396 + ... + 7209065517.

It is an arithmetic number, because the mean of its divisors is an integer number (223481029167).

Almost surely, 2^879505985693 is an apocalyptic number.

It is an amenable number.

879505985693 is a deficient number, since it is larger than the sum of its proper divisors (14418130975).

879505985693 is a wasteful number, since it uses less digits than its factorization.

879505985693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14418130974.

The product of its (nonzero) digits is 734832000, while the sum is 74.

The spelling of 879505985693 in words is "eight hundred seventy-nine billion, five hundred five million, nine hundred eighty-five thousand, six hundred ninety-three".