78881609109 has 16 divisors (see below), whose sum is σ = 107081823744. Its totient is φ = 51640470000.

The previous prime is 78881609069. The next prime is 78881609231. The reversal of 78881609109 is 90190618887.

It is not a de Polignac number, because 78881609109 - 2⁸ = 78881608853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78881609309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 684259 + ... + 791184.

It is an arithmetic number, because the mean of its divisors is an integer number (6692613984).

Almost surely, 2^78881609109 is an apocalyptic number.

It is an amenable number.

78881609109 is a deficient number, since it is larger than the sum of its proper divisors (28200214635).

78881609109 is a wasteful number, since it uses less digits than its factorization.

78881609109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475768.

The product of its (nonzero) digits is 1741824, while the sum is 57.

The spelling of 78881609109 in words is "seventy-eight billion, eight hundred eighty-one million, six hundred nine thousand, one hundred nine".