878995538661 has 16 divisors (see below), whose sum is σ = 1172632338560. Its totient is φ = 585677977920.

The previous prime is 878995538621. The next prime is 878995538689. The reversal of 878995538661 is 166835599878.

It is a de Polignac number, because none of the positive numbers 2^k-878995538661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878995538621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62648595 + ... + 62662623.

It is an arithmetic number, because the mean of its divisors is an integer number (73289521160).

Almost surely, 2^878995538661 is an apocalyptic number.

It is an amenable number.

878995538661 is a deficient number, since it is larger than the sum of its proper divisors (293636799899).

878995538661 is a wasteful number, since it uses less digits than its factorization.

878995538661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23916.

The product of its digits is 783820800, while the sum is 75.

The spelling of 878995538661 in words is "eight hundred seventy-eight billion, nine hundred ninety-five million, five hundred thirty-eight thousand, six hundred sixty-one".