111869394778 has 16 divisors (see below), whose sum is σ = 177682161384. Its totient is φ = 52642275840.

The previous prime is 111869394737. The next prime is 111869394779. The reversal of 111869394778 is 877493968111.

It can be written as a sum of positive squares in 4 ways, for example, as 67759734249 + 44109660529 = 260307^2 + 210023^2 .

It is a super-2 number, since 2×111869394778² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (111869394779) 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, 1048726 + ... + 1150462.

Almost surely, 2^111869394778 is an apocalyptic number.

111869394778 is a deficient number, since it is larger than the sum of its proper divisors (65812766606).

111869394778 is a wasteful number, since it uses less digits than its factorization.

111869394778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134097.

The product of its digits is 18289152, while the sum is 64.

The spelling of 111869394778 in words is "one hundred eleven billion, eight hundred sixty-nine million, three hundred ninety-four thousand, seven hundred seventy-eight".