78409160881 has 4 divisors (see below), whose sum is σ = 78430248000. Its totient is φ = 78388073764.

The previous prime is 78409160857. The next prime is 78409160891. The reversal of 78409160881 is 18806190487.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18806190487 = 7 ⋅2686598641.

It is a cyclic number.

It is not a de Polignac number, because 78409160881 - 2⁹ = 78409160369 is a prime.

It is a super-2 number, since 2×78409160881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78409160831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10537981 + ... + 10545418.

It is an arithmetic number, because the mean of its divisors is an integer number (19607562000).

Almost surely, 2^78409160881 is an apocalyptic number.

It is an amenable number.

78409160881 is a deficient number, since it is larger than the sum of its proper divisors (21087119).

78409160881 is a wasteful number, since it uses less digits than its factorization.

78409160881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21087118.

The product of its (nonzero) digits is 774144, while the sum is 52.

The spelling of 78409160881 in words is "seventy-eight billion, four hundred nine million, one hundred sixty thousand, eight hundred eighty-one".