84111187869 has 12 divisors (see below), whose sum is σ = 123158239516. Its totient is φ = 55305986112.

The previous prime is 84111187781. The next prime is 84111187871. The reversal of 84111187869 is 96878111148.

It can be written as a sum of positive squares in 2 ways, for example, as 63587187225 + 20524000644 = 252165^2 + 143262^2 .

It is not a de Polignac number, because 84111187869 - 2¹² = 84111183773 is a prime.

It is a super-2 number, since 2×84111187869² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84111187879) 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 11 ways as a sum of consecutive naturals, for example, 64010902 + ... + 64012215.

Almost surely, 2^84111187869 is an apocalyptic number.

It is an amenable number.

84111187869 is a deficient number, since it is larger than the sum of its proper divisors (39047051647).

84111187869 is a wasteful number, since it uses less digits than its factorization.

84111187869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128023196 (or 128023193 counting only the distinct ones).

The product of its digits is 774144, while the sum is 54.

The spelling of 84111187869 in words is "eighty-four billion, one hundred eleven million, one hundred eighty-seven thousand, eight hundred sixty-nine".