999999867077851 has 4 divisors (see below), whose sum is σ = 1000010556298072. Its totient is φ = 999989177857632.

The previous prime is 999999867077819. The next prime is 999999867077891. The reversal of 999999867077851 is 158770768999999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 999999867077851 - 2⁵ = 999999867077819 is a prime.

It is the 31622775-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999999867077801) by changing a digit.

It is a nontrivial repunit in base 31622774.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5344469781 + ... + 5344656886.

It is an arithmetic number, because the mean of its divisors is an integer number (250002639074518).

Almost surely, 2^{999999867077851} is an apocalyptic number.

999999867077851 is a deficient number, since it is larger than the sum of its proper divisors (10689220221).

999999867077851 is a wasteful number, since it uses less digits than its factorization.

999999867077851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10689220220.

The product of its (nonzero) digits is 349985784960, while the sum is 103.

The spelling of 999999867077851 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, eight hundred sixty-seven million, seventy-seven thousand, eight hundred fifty-one".