78120220211111 has 8 divisors (see below), whose sum is σ = 86403237323424. Its totient is φ = 70162027299360.

The previous prime is 78120220211083. The next prime is 78120220211153. The reversal of 78120220211111 is 11111202202187.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78120220211111 is a prime.

It is a super-2 number, since 2×78120220211111² (a number of 29 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 (78120220111111) 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, 81206049635 + ... + 81206050596.

It is an arithmetic number, because the mean of its divisors is an integer number (10800404665428).

Almost surely, 2^{78120220211111} is an apocalyptic number.

78120220211111 is a deficient number, since it is larger than the sum of its proper divisors (8283017112313).

78120220211111 is a wasteful number, since it uses less digits than its factorization.

78120220211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162412100281.

The product of its (nonzero) digits is 896, while the sum is 29.

Adding to 78120220211111 its reverse (11111202202187), we get a palindrome (89231422413298).

The spelling of 78120220211111 in words is "seventy-eight trillion, one hundred twenty billion, two hundred twenty million, two hundred eleven thousand, one hundred eleven".