78344423011 has 4 divisors (see below), whose sum is σ = 78621258712. Its totient is φ = 78067587312.

The previous prime is 78344422997. The next prime is 78344423063. The reversal of 78344423011 is 11032444387.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78344423011 - 2⁷ = 78344422883 is a prime.

It is a super-2 number, since 2×78344423011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78344423081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138417426 + ... + 138417991.

It is an arithmetic number, because the mean of its divisors is an integer number (19655314678).

Almost surely, 2^78344423011 is an apocalyptic number.

78344423011 is a deficient number, since it is larger than the sum of its proper divisors (276835701).

78344423011 is a wasteful number, since it uses less digits than its factorization.

78344423011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276835700.

The product of its (nonzero) digits is 64512, while the sum is 37.

Adding to 78344423011 its reverse (11032444387), we get a palindrome (89376867398).

The spelling of 78344423011 in words is "seventy-eight billion, three hundred forty-four million, four hundred twenty-three thousand, eleven".