78441977187311 has 16 divisors (see below), whose sum is σ = 82305214414848. Its totient is φ = 74662207509600.

The previous prime is 78441977187283. The next prime is 78441977187331. The reversal of 78441977187311 is 11378177914487.

It is a cyclic number.

It is not a de Polignac number, because 78441977187311 - 2¹⁸ = 78441976925167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78441977187331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27432146 + ... + 30156368.

It is an arithmetic number, because the mean of its divisors is an integer number (5144075900928).

Almost surely, 2^{78441977187311} is an apocalyptic number.

78441977187311 is a deficient number, since it is larger than the sum of its proper divisors (3863237227537).

78441977187311 is a wasteful number, since it uses less digits than its factorization.

78441977187311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2739542.

The product of its digits is 66382848, while the sum is 68.

The spelling of 78441977187311 in words is "seventy-eight trillion, four hundred forty-one billion, nine hundred seventy-seven million, one hundred eighty-seven thousand, three hundred eleven".