99999999991869 has 8 divisors (see below), whose sum is σ = 139130434771392. Its totient is φ = 63768115936800.

The previous prime is 99999999991867. The next prime is 99999999991877. The reversal of 99999999991869 is 96819999999999.

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

It is not a de Polignac number, because 99999999991869 - 2¹ = 99999999991867 is a prime.

It is a super-2 number, since 2×99999999991869² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999999991867) 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, 724637681032 + ... + 724637681169.

It is an arithmetic number, because the mean of its divisors is an integer number (17391304346424).

Almost surely, 2^{99999999991869} is an apocalyptic number.

It is an amenable number.

99999999991869 is a deficient number, since it is larger than the sum of its proper divisors (39130434779523).

99999999991869 is a wasteful number, since it uses less digits than its factorization.

99999999991869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449275362227.

The product of its digits is 1506290861232, while the sum is 114.

The spelling of 99999999991869 in words is "ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-one thousand, eight hundred sixty-nine".