78399440011 has 2 divisors, whose sum is σ = 78399440012. Its totient is φ = 78399440010.

The previous prime is 78399440003. The next prime is 78399440017. The reversal of 78399440011 is 11004499387.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78399440011 - 2³ = 78399440003 is a prime.

It is a super-2 number, since 2×78399440011² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78399440017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39199720005 + 39199720006.

It is an arithmetic number, because the mean of its divisors is an integer number (39199720006).

Almost surely, 2^78399440011 is an apocalyptic number.

78399440011 is a deficient number, since it is larger than the sum of its proper divisors (1).

78399440011 is an equidigital number, since it uses as much as digits as its factorization.

78399440011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 78399440011 in words is "seventy-eight billion, three hundred ninety-nine million, four hundred forty thousand, eleven".