78111111012 has 72 divisors (see below), whose sum is σ = 212119010208. Its totient is φ = 22277671680.

The previous prime is 78111111011. The next prime is 78111111017. The reversal of 78111111012 is 21011111187.

It is a super-2 number, since 2×78111111012² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78111111011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1557538 + ... + 1606905.

It is an arithmetic number, because the mean of its divisors is an integer number (2946097364).

Almost surely, 2^78111111012 is an apocalyptic number.

It is an amenable number.

78111111012 is an abundant number, since it is smaller than the sum of its proper divisors (134007899196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78111111012 is a wasteful number, since it uses less digits than its factorization.

78111111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3164489 (or 3164476 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 24.

Adding to 78111111012 its reverse (21011111187), we get a palindrome (99122222199).

The spelling of 78111111012 in words is "seventy-eight billion, one hundred eleven million, one hundred eleven thousand, twelve".