78220131311 has 16 divisors (see below), whose sum is σ = 93763931136. Its totient is φ = 63845814816.

The previous prime is 78220131307. The next prime is 78220131317. The reversal of 78220131311 is 11313102287.

It is not a de Polignac number, because 78220131311 - 2² = 78220131307 is a prime.

It is a super-2 number, since 2×78220131311² (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 (78220131317) 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, 3200681 + ... + 3225026.

It is an arithmetic number, because the mean of its divisors is an integer number (5860245696).

Almost surely, 2^78220131311 is an apocalyptic number.

78220131311 is a deficient number, since it is larger than the sum of its proper divisors (15543799825).

78220131311 is a wasteful number, since it uses less digits than its factorization.

78220131311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6425798.

The product of its (nonzero) digits is 2016, while the sum is 29.

Adding to 78220131311 its reverse (11313102287), we get a palindrome (89533233598).

The spelling of 78220131311 in words is "seventy-eight billion, two hundred twenty million, one hundred thirty-one thousand, three hundred eleven".