78278799139 has 2 divisors, whose sum is σ = 78278799140. Its totient is φ = 78278799138.

The previous prime is 78278799107. The next prime is 78278799161. The reversal of 78278799139 is 93199787287.

It is a strong prime.

It is an emirp because it is prime and its reverse (93199787287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78278799139 - 2⁵ = 78278799107 is a prime.

It is a super-2 number, since 2×78278799139² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78278799439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39139399569 + 39139399570.

It is an arithmetic number, because the mean of its divisors is an integer number (39139399570).

Almost surely, 2^78278799139 is an apocalyptic number.

78278799139 is a deficient number, since it is larger than the sum of its proper divisors (1).

78278799139 is an equidigital number, since it uses as much as digits as its factorization.

78278799139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96018048, while the sum is 70.

The spelling of 78278799139 in words is "seventy-eight billion, two hundred seventy-eight million, seven hundred ninety-nine thousand, one hundred thirty-nine".