869878059991 has 8 divisors (see below), whose sum is σ = 955472469120. Its totient is φ = 788264786232.

The previous prime is 869878059913. The next prime is 869878060027. The reversal of 869878059991 is 199950878968.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 869878059991 - 2³⁵ = 835518321623 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 (869878059091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 995283385 + ... + 995284258.

It is an arithmetic number, because the mean of its divisors is an integer number (119434058640).

Almost surely, 2^869878059991 is an apocalyptic number.

869878059991 is a deficient number, since it is larger than the sum of its proper divisors (85594409129).

869878059991 is a wasteful number, since it uses less digits than its factorization.

869878059991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990567685.

The product of its (nonzero) digits is 705438720, while the sum is 79.

The spelling of 869878059991 in words is "eight hundred sixty-nine billion, eight hundred seventy-eight million, fifty-nine thousand, nine hundred ninety-one".