78121113303311 has 16 divisors (see below), whose sum is σ = 84266819330400. Its totient is φ = 71994952552320.

The previous prime is 78121113303223. The next prime is 78121113303367. The reversal of 78121113303311 is 11330331112187.

It is a cyclic number.

It is not a de Polignac number, because 78121113303311 - 2²² = 78121109109007 is a prime.

It is a super-2 number, since 2×78121113303311² (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 (78121113303371) 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, 29490140 + ... + 32029838.

It is an arithmetic number, because the mean of its divisors is an integer number (5266676208150).

Almost surely, 2^{78121113303311} is an apocalyptic number.

78121113303311 is a deficient number, since it is larger than the sum of its proper divisors (6145706027089).

78121113303311 is a wasteful number, since it uses less digits than its factorization.

78121113303311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2543546.

The product of its (nonzero) digits is 9072, while the sum is 35.

Adding to 78121113303311 its reverse (11330331112187), we get a palindrome (89451444415498).

The spelling of 78121113303311 in words is "seventy-eight trillion, one hundred twenty-one billion, one hundred thirteen million, three hundred three thousand, three hundred eleven".