78958341691 has 2 divisors, whose sum is σ = 78958341692. Its totient is φ = 78958341690.

The previous prime is 78958341619. The next prime is 78958341739. The reversal of 78958341691 is 19614385987.

Together with previous prime (78958341619) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78958341691 - 2¹³ = 78958333499 is a prime.

It is not a weakly prime, because it can be changed into another prime (78958341611) 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 as a sum of consecutive naturals, namely, 39479170845 + 39479170846.

It is an arithmetic number, because the mean of its divisors is an integer number (39479170846).

Almost surely, 2^78958341691 is an apocalyptic number.

78958341691 is a deficient number, since it is larger than the sum of its proper divisors (1).

78958341691 is an equidigital number, since it uses as much as digits as its factorization.

78958341691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13063680, while the sum is 61.

The spelling of 78958341691 in words is "seventy-eight billion, nine hundred fifty-eight million, three hundred forty-one thousand, six hundred ninety-one".