78111111010 has 32 divisors (see below), whose sum is σ = 142714794240. Its totient is φ = 30777884928.

The previous prime is 78111111007. The next prime is 78111111011. The reversal of 78111111010 is 1011111187.

It is a super-2 number, since 2×78111111010² (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 15 ways as a sum of consecutive naturals, for example, 27850 + ... + 396229.

It is an arithmetic number, because the mean of its divisors is an integer number (4459837320).

Almost surely, 2^78111111010 is an apocalyptic number.

78111111010 is a deficient number, since it is larger than the sum of its proper divisors (64603683230).

78111111010 is a wasteful number, since it uses less digits than its factorization.

78111111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424362.

The product of its (nonzero) digits is 56, while the sum is 22.

Adding to 78111111010 its reverse (1011111187), we get a palindrome (79122222197).

The spelling of 78111111010 in words is "seventy-eight billion, one hundred eleven million, one hundred eleven thousand, ten".