872945988517 has 4 divisors (see below), whose sum is σ = 874559567596. Its totient is φ = 871332409440.

The previous prime is 872945988511. The next prime is 872945988553. The reversal of 872945988517 is 715889549278.

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 459919974276 + 413026014241 = 678174^2 + 642671^2 .

It is a cyclic number.

It is not a de Polignac number, because 872945988517 - 2³¹ = 870798504869 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 872945988517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (872945988511) by changing a digit.

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, 806788728 + ... + 806789809.

It is an arithmetic number, because the mean of its divisors is an integer number (218639891899).

Almost surely, 2^872945988517 is an apocalyptic number.

It is an amenable number.

872945988517 is a deficient number, since it is larger than the sum of its proper divisors (1613579079).

872945988517 is a wasteful number, since it uses less digits than its factorization.

872945988517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613579078.

The product of its digits is 406425600, while the sum is 73.

The spelling of 872945988517 in words is "eight hundred seventy-two billion, nine hundred forty-five million, nine hundred eighty-eight thousand, five hundred seventeen".