78104158109 has 2 divisors, whose sum is σ = 78104158110. Its totient is φ = 78104158108.

The previous prime is 78104158079. The next prime is 78104158123. The reversal of 78104158109 is 90185140187.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74964797209 + 3139360900 = 273797^2 + 56030^2 .

It is a cyclic number.

It is not a de Polignac number, because 78104158109 - 2¹² = 78104154013 is a prime.

It is a super-2 number, since 2×78104158109² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78104158109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78104158159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39052079054 + 39052079055.

It is an arithmetic number, because the mean of its divisors is an integer number (39052079055).

Almost surely, 2^78104158109 is an apocalyptic number.

It is an amenable number.

78104158109 is a deficient number, since it is larger than the sum of its proper divisors (1).

78104158109 is an equidigital number, since it uses as much as digits as its factorization.

78104158109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 44.

The spelling of 78104158109 in words is "seventy-eight billion, one hundred four million, one hundred fifty-eight thousand, one hundred nine".